diff --git a/AUTHORS b/AUTHORS
index e624c51b..5991853d 100644
--- a/AUTHORS
+++ b/AUTHORS
@@ -24,7 +24,7 @@ and nasty bugs.
 
 -----
 
-Copyright (C) 1998-2015, 2018-2020 Free Software Foundation, Inc.
+Copyright (C) 1998-2015, 2018-2021 Free Software Foundation, Inc.
 
 This file is part of Bison, the GNU Compiler Compiler.
 
diff --git a/ChangeLog-2012 b/ChangeLog-2012
index d56c1267..6ff8f0d7 100644
--- a/ChangeLog-2012
+++ b/ChangeLog-2012
@@ -26733,7 +26733,7 @@
 
 	-----
 
-	Copyright (C) 1987-1988, 1991-2015, 2018-2020 Free Software
+	Copyright (C) 1987-1988, 1991-2015, 2018-2021 Free Software
 	Foundation, Inc.
 
 	Copying and distribution of this file, with or without
diff --git a/Makefile.am b/Makefile.am
index e5998639..7a930c26 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -1,6 +1,6 @@
 ## Process this file with automake to produce Makefile.in.
 
-# Copyright (C) 2001-2015, 2018-2020 Free Software Foundation, Inc.
+# Copyright (C) 2001-2015, 2018-2021 Free Software Foundation, Inc.
 #
 # This program is free software: you can redistribute it and/or modify
 # it under the terms of the GNU General Public License as published by
diff --git a/NEWS b/NEWS
index f2c235eb..d780a5f1 100644
--- a/NEWS
+++ b/NEWS
@@ -4620,7 +4620,7 @@ mode: outline
 fill-column: 76
 End:
 
-Copyright (C) 1995-2015, 2018-2020 Free Software Foundation, Inc.
+Copyright (C) 1995-2015, 2018-2021 Free Software Foundation, Inc.
 
 This file is part of Bison, the GNU Parser Generator.
 
diff --git a/PACKAGING b/PACKAGING
index d4bf6d84..69bfc96e 100644
--- a/PACKAGING
+++ b/PACKAGING
@@ -36,7 +36,7 @@ to the bison package.
 
 -----
 
-Copyright (C) 2002, 2005, 2009-2015, 2018-2020 Free Software Foundation,
+Copyright (C) 2002, 2005, 2009-2015, 2018-2021 Free Software Foundation,
 Inc.
 
 This file is part of Bison, the GNU Compiler Compiler.
diff --git a/README b/README
index 94f8a4f8..e97c65a6 100644
--- a/README
+++ b/README
@@ -120,7 +120,7 @@ fill-column: 76
 ispell-dictionary: "american"
 End:
 
-Copyright (C) 1992, 1998-1999, 2003-2005, 2008-2015, 2018-2020 Free
+Copyright (C) 1992, 1998-1999, 2003-2005, 2008-2015, 2018-2021 Free
 Software Foundation, Inc.
 
 This file is part of GNU bison, the GNU Compiler Compiler.
diff --git a/README-alpha b/README-alpha
index dbd0e88e..3dff3b2e 100644
--- a/README-alpha
+++ b/README-alpha
@@ -12,7 +12,7 @@ the problems you encounter.
 
 -----
 
-Copyright (C) 2002, 2004, 2009-2015, 2018-2020 Free Software Foundation,
+Copyright (C) 2002, 2004, 2009-2015, 2018-2021 Free Software Foundation,
 Inc.
 
 This file is part of GNU Bison.
diff --git a/README-hacking.md b/README-hacking.md
index b84f7274..61c3a47c 100644
--- a/README-hacking.md
+++ b/README-hacking.md
@@ -638,7 +638,7 @@ bootstrapped.
 
 <!--
 
-Copyright (C) 2002-2005, 2007-2015, 2018-2020 Free Software Foundation,
+Copyright (C) 2002-2005, 2007-2015, 2018-2021 Free Software Foundation,
 Inc.
 
 This file is part of GNU Bison.
diff --git a/THANKS b/THANKS
index a5a99f12..7c381c98 100644
--- a/THANKS
+++ b/THANKS
@@ -238,7 +238,7 @@ End:
 
 -----
 
-Copyright (C) 2000-2015, 2018-2020 Free Software Foundation, Inc.
+Copyright (C) 2000-2015, 2018-2021 Free Software Foundation, Inc.
 
 This file is part of Bison, the GNU Parser Generator.
 
diff --git a/TODO b/TODO
index 0fae0db5..4f89e749 100644
--- a/TODO
+++ b/TODO
@@ -805,7 +805,7 @@ fill-column: 76
 ispell-dictionary: "american"
 End:
 
-Copyright (C) 2001-2004, 2006, 2008-2015, 2018-2020 Free Software
+Copyright (C) 2001-2004, 2006, 2008-2015, 2018-2021 Free Software
 Foundation, Inc.
 
 This file is part of Bison, the GNU Compiler Compiler.
diff --git a/bootstrap.conf b/bootstrap.conf
index 6efae84b..eb0c6eba 100644
--- a/bootstrap.conf
+++ b/bootstrap.conf
@@ -1,6 +1,6 @@
 # Bootstrap configuration.
 
-# Copyright (C) 2006-2015, 2018-2020 Free Software Foundation, Inc.
+# Copyright (C) 2006-2015, 2018-2021 Free Software Foundation, Inc.
 
 # This program is free software: you can redistribute it and/or modify
 # it under the terms of the GNU General Public License as published by
diff --git a/build-aux/Darwin.valgrind b/build-aux/Darwin.valgrind
index dec3b341..cb8b4973 100644
--- a/build-aux/Darwin.valgrind
+++ b/build-aux/Darwin.valgrind
@@ -1,4 +1,4 @@
-# Copyright (C) 2012-2015, 2018-2020 Free Software Foundation, Inc.
+# Copyright (C) 2012-2015, 2018-2021 Free Software Foundation, Inc.
 
 # This program is free software: you can redistribute it and/or modify
 # it under the terms of the GNU General Public License as published by
diff --git a/build-aux/Linux.valgrind b/build-aux/Linux.valgrind
index a7ebd2c7..2e0290f8 100644
--- a/build-aux/Linux.valgrind
+++ b/build-aux/Linux.valgrind
@@ -1,4 +1,4 @@
-# Copyright (C) 2012-2015, 2018-2020 Free Software Foundation, Inc.
+# Copyright (C) 2012-2015, 2018-2021 Free Software Foundation, Inc.
 
 # This program is free software: you can redistribute it and/or modify
 # it under the terms of the GNU General Public License as published by
diff --git a/build-aux/cross-options.pl b/build-aux/cross-options.pl
index 31fe8065..754b4ee7 100755
--- a/build-aux/cross-options.pl
+++ b/build-aux/cross-options.pl
@@ -2,7 +2,7 @@
 
 # Generate a release announcement message.
 
-# Copyright (C) 2007-2020 Free Software Foundation, Inc.
+# Copyright (C) 2007-2021 Free Software Foundation, Inc.
 #
 # This program is free software: you can redistribute it and/or modify
 # it under the terms of the GNU General Public License as published by
diff --git a/build-aux/local.mk b/build-aux/local.mk
index 8030dec2..d95eaaaf 100644
--- a/build-aux/local.mk
+++ b/build-aux/local.mk
@@ -1,4 +1,4 @@
-## Copyright (C) 2000-2015, 2018-2020 Free Software Foundation, Inc.
+## Copyright (C) 2000-2015, 2018-2021 Free Software Foundation, Inc.
 ##
 ## This program is free software: you can redistribute it and/or modify
 ## it under the terms of the GNU General Public License as published by
diff --git a/build-aux/update-b4-copyright b/build-aux/update-b4-copyright
index 85646436..86aa1014 100755
--- a/build-aux/update-b4-copyright
+++ b/build-aux/update-b4-copyright
@@ -3,7 +3,7 @@
 # Update b4_copyright invocations or b4_copyright_years definitions to
 # include the current year.
 
-# Copyright (C) 2009-2015, 2018-2020 Free Software Foundation, Inc.
+# Copyright (C) 2009-2015, 2018-2021 Free Software Foundation, Inc.
 
 # This program is free software; you can redistribute it and/or modify
 # it under the terms of the GNU General Public License as published by
diff --git a/build-aux/update-package-copyright-year b/build-aux/update-package-copyright-year
index ad27b0ce..ba7297a7 100755
--- a/build-aux/update-package-copyright-year
+++ b/build-aux/update-package-copyright-year
@@ -2,7 +2,7 @@
 
 # In configure.ac, update PACKAGE_COPYRIGHT_YEAR to the current year.
 
-# Copyright (C) 2010-2015, 2018-2020 Free Software Foundation, Inc.
+# Copyright (C) 2010-2015, 2018-2021 Free Software Foundation, Inc.
 #
 # This program is free software; you can redistribute it and/or modify
 # it under the terms of the GNU General Public License as published by
diff --git a/build-aux/update-test b/build-aux/update-test
index d63a95e4..dd73e25a 100755
--- a/build-aux/update-test
+++ b/build-aux/update-test
@@ -2,7 +2,7 @@
 
 # Update expectations in an Autotest test suite.
 
-# Copyright (C) 2019-2020 Free Software Foundation, Inc.
+# Copyright (C) 2019-2021 Free Software Foundation, Inc.
 #
 # This program is free software: you can redistribute it and/or modify
 # it under the terms of the GNU General Public License as published by
diff --git a/cfg.mk b/cfg.mk
index 114aa814..6725a186 100644
--- a/cfg.mk
+++ b/cfg.mk
@@ -1,5 +1,5 @@
 ## Customize maint.mk                           -*- makefile -*-
-## Copyright (C) 2008-2015, 2018-2020 Free Software Foundation, Inc.
+## Copyright (C) 2008-2015, 2018-2021 Free Software Foundation, Inc.
 
 ## This program is free software: you can redistribute it and/or modify
 ## it under the terms of the GNU General Public License as published by
diff --git a/configure.ac b/configure.ac
index 4993a2c6..b1258fca 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1,6 +1,6 @@
 # Configure template for GNU Bison.                   -*-Autoconf-*-
 #
-# Copyright (C) 2001-2015, 2018-2020 Free Software Foundation, Inc.
+# Copyright (C) 2001-2015, 2018-2021 Free Software Foundation, Inc.
 #
 # This program is free software: you can redistribute it and/or modify
 # it under the terms of the GNU General Public License as published by
@@ -29,7 +29,7 @@ AC_INIT([GNU Bison],
         [bug-bison@gnu.org],
         [],
         [https://www.gnu.org/software/bison/])
-AC_SUBST([PACKAGE_COPYRIGHT_YEAR], [2020])
+AC_SUBST([PACKAGE_COPYRIGHT_YEAR], [2021])
 AC_DEFINE_UNQUOTED([PACKAGE_COPYRIGHT_YEAR], [$PACKAGE_COPYRIGHT_YEAR],
                    [The copyright year for this package])
 
diff --git a/data/README.md b/data/README.md
index 32c34a53..4a33fb35 100644
--- a/data/README.md
+++ b/data/README.md
@@ -198,7 +198,7 @@ fill-column: 76
 ispell-dictionary: "american"
 End:
 
-Copyright (C) 2002, 2008-2015, 2018-2020 Free Software Foundation, Inc.
+Copyright (C) 2002, 2008-2015, 2018-2021 Free Software Foundation, Inc.
 
 This file is part of GNU Bison.
 
diff --git a/data/bison-default.css b/data/bison-default.css
index 21e672d2..aadaba17 100644
--- a/data/bison-default.css
+++ b/data/bison-default.css
@@ -1,5 +1,5 @@
 /* Default styling rules for Bison when doing terminal output.
-   Copyright (C) 2019-2020 Free Software Foundation, Inc.
+   Copyright (C) 2019-2021 Free Software Foundation, Inc.
 
    This program is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
diff --git a/data/local.mk b/data/local.mk
index 3ead3af9..b3f72497 100644
--- a/data/local.mk
+++ b/data/local.mk
@@ -1,4 +1,4 @@
-## Copyright (C) 2002, 2005-2015, 2018-2020 Free Software Foundation,
+## Copyright (C) 2002, 2005-2015, 2018-2021 Free Software Foundation,
 ## Inc.
 
 ## This program is free software: you can redistribute it and/or modify
diff --git a/data/skeletons/bison.m4 b/data/skeletons/bison.m4
index ace9d524..739bbbfb 100644
--- a/data/skeletons/bison.m4
+++ b/data/skeletons/bison.m4
@@ -2,7 +2,7 @@
 
 # Language-independent M4 Macros for Bison.
 
-# Copyright (C) 2002, 2004-2015, 2018-2020 Free Software Foundation,
+# Copyright (C) 2002, 2004-2015, 2018-2021 Free Software Foundation,
 # Inc.
 
 # This program is free software: you can redistribute it and/or modify
diff --git a/data/skeletons/c++-skel.m4 b/data/skeletons/c++-skel.m4
index 6d3becf5..01ee793f 100644
--- a/data/skeletons/c++-skel.m4
+++ b/data/skeletons/c++-skel.m4
@@ -2,7 +2,7 @@
 
 # C++ skeleton dispatching for Bison.
 
-# Copyright (C) 2006-2007, 2009-2015, 2018-2020 Free Software
+# Copyright (C) 2006-2007, 2009-2015, 2018-2021 Free Software
 # Foundation, Inc.
 
 # This program is free software: you can redistribute it and/or modify
diff --git a/data/skeletons/c++.m4 b/data/skeletons/c++.m4
index b76aebe6..cfd4e6ed 100644
--- a/data/skeletons/c++.m4
+++ b/data/skeletons/c++.m4
@@ -2,7 +2,7 @@
 
 # C++ skeleton for Bison
 
-# Copyright (C) 2002-2020 Free Software Foundation, Inc.
+# Copyright (C) 2002-2021 Free Software Foundation, Inc.
 
 # This program is free software: you can redistribute it and/or modify
 # it under the terms of the GNU General Public License as published by
diff --git a/data/skeletons/c-like.m4 b/data/skeletons/c-like.m4
index 1e5ab02c..d45b708b 100644
--- a/data/skeletons/c-like.m4
+++ b/data/skeletons/c-like.m4
@@ -2,7 +2,7 @@
 
 # Common code for C-like languages (C, C++, Java, etc.)
 
-# Copyright (C) 2012-2015, 2018-2020 Free Software Foundation, Inc.
+# Copyright (C) 2012-2015, 2018-2021 Free Software Foundation, Inc.
 
 # This program is free software: you can redistribute it and/or modify
 # it under the terms of the GNU General Public License as published by
diff --git a/data/skeletons/c-skel.m4 b/data/skeletons/c-skel.m4
index 68d057cb..4f1e5a83 100644
--- a/data/skeletons/c-skel.m4
+++ b/data/skeletons/c-skel.m4
@@ -2,7 +2,7 @@
 
 # C skeleton dispatching for Bison.
 
-# Copyright (C) 2006-2007, 2009-2015, 2018-2020 Free Software
+# Copyright (C) 2006-2007, 2009-2015, 2018-2021 Free Software
 # Foundation, Inc.
 
 # This program is free software: you can redistribute it and/or modify
diff --git a/data/skeletons/c.m4 b/data/skeletons/c.m4
index 4391dbc2..fccd4cc8 100644
--- a/data/skeletons/c.m4
+++ b/data/skeletons/c.m4
@@ -2,7 +2,7 @@
 
 # C M4 Macros for Bison.
 
-# Copyright (C) 2002, 2004-2015, 2018-2020 Free Software Foundation,
+# Copyright (C) 2002, 2004-2015, 2018-2021 Free Software Foundation,
 # Inc.
 
 # This program is free software: you can redistribute it and/or modify
diff --git a/data/skeletons/d-skel.m4 b/data/skeletons/d-skel.m4
index 89cd5114..c3943f78 100644
--- a/data/skeletons/d-skel.m4
+++ b/data/skeletons/d-skel.m4
@@ -2,7 +2,7 @@
 
 # D skeleton dispatching for Bison.
 
-# Copyright (C) 2018-2020 Free Software Foundation, Inc.
+# Copyright (C) 2018-2021 Free Software Foundation, Inc.
 
 # This program is free software: you can redistribute it and/or modify
 # it under the terms of the GNU General Public License as published by
diff --git a/data/skeletons/d.m4 b/data/skeletons/d.m4
index e0a554b9..4b5f9f95 100644
--- a/data/skeletons/d.m4
+++ b/data/skeletons/d.m4
@@ -2,7 +2,7 @@
 
 # D language support for Bison
 
-# Copyright (C) 2018-2020 Free Software Foundation, Inc.
+# Copyright (C) 2018-2021 Free Software Foundation, Inc.
 
 # This program is free software: you can redistribute it and/or modify
 # it under the terms of the GNU General Public License as published by
diff --git a/data/skeletons/glr.c b/data/skeletons/glr.c
index b9334aa2..23c02079 100644
--- a/data/skeletons/glr.c
+++ b/data/skeletons/glr.c
@@ -2,7 +2,7 @@
 
 # GLR skeleton for Bison
 
-# Copyright (C) 2002-2015, 2018-2020 Free Software Foundation, Inc.
+# Copyright (C) 2002-2015, 2018-2021 Free Software Foundation, Inc.
 
 # This program is free software: you can redistribute it and/or modify
 # it under the terms of the GNU General Public License as published by
@@ -199,7 +199,7 @@ b4_glr_cc_if([],
 [b4_header_if(
 [b4_output_begin([b4_spec_header_file])
 b4_copyright([Skeleton interface for Bison GLR parsers in C],
-             [2002-2015, 2018-2020])[
+             [2002-2015, 2018-2021])[
 ]b4_cpp_guard_open([b4_spec_mapped_header_file])[
 ]b4_shared_declarations[
 ]b4_cpp_guard_close([b4_spec_mapped_header_file])[
@@ -213,7 +213,7 @@ b4_copyright([Skeleton interface for Bison GLR parsers in C],
 
 b4_output_begin([b4_parser_file_name])
 b4_copyright([Skeleton implementation for Bison GLR parsers in C],
-             [2002-2015, 2018-2020])[
+             [2002-2015, 2018-2021])[
 /* C GLR parser skeleton written by Paul Hilfinger.  */
 
 ]b4_disclaimer[
diff --git a/data/skeletons/glr.cc b/data/skeletons/glr.cc
index a852bde6..aa66d62c 100644
--- a/data/skeletons/glr.cc
+++ b/data/skeletons/glr.cc
@@ -1,6 +1,6 @@
 # C++ GLR skeleton for Bison
 
-# Copyright (C) 2002-2015, 2018-2020 Free Software Foundation, Inc.
+# Copyright (C) 2002-2015, 2018-2021 Free Software Foundation, Inc.
 
 # This program is free software: you can redistribute it and/or modify
 # it under the terms of the GNU General Public License as published by
@@ -381,7 +381,7 @@ b4_percent_code_get([[requires]])[
 ]b4_header_if(
 [b4_output_begin([b4_spec_header_file])
 b4_copyright([Skeleton interface for Bison GLR parsers in C++],
-             [2002-2015, 2018-2020])[
+             [2002-2015, 2018-2021])[
 // C++ GLR parser skeleton written by Akim Demaille.
 
 ]b4_disclaimer[
diff --git a/data/skeletons/glr2.cc b/data/skeletons/glr2.cc
index 8b7c7cd5..0925b37d 100644
--- a/data/skeletons/glr2.cc
+++ b/data/skeletons/glr2.cc
@@ -1,6 +1,6 @@
 # C++ GLR skeleton for Bison
 
-# Copyright (C) 2002-2015, 2018-2020 Free Software Foundation, Inc.
+# Copyright (C) 2002-2015, 2018-2021 Free Software Foundation, Inc.
 
 # This program is free software: you can redistribute it and/or modify
 # it under the terms of the GNU General Public License as published by
@@ -327,7 +327,7 @@ m4_define([b4_shared_declarations],
 ]b4_header_if([[
 ]b4_output_begin([b4_spec_header_file])[
 ]b4_copyright([Skeleton interface for Bison GLR parsers in C++],
-             [2002-2015, 2018-2020])[
+             [2002-2015, 2018-2021])[
 // C++ GLR parser skeleton written by Valentin Tolmer.
 
 ]b4_disclaimer[
@@ -343,7 +343,7 @@ m4_define([b4_shared_declarations],
 
 ]b4_output_begin([b4_parser_file_name])[
 ]b4_copyright([Skeleton implementation for Bison GLR parsers in C],
-              [2002-2015, 2018-2019])[
+              [2002-2015, 2018-2021])[
 // C++ GLR parser skeleton written by Valentin Tolmer.
 
 ]b4_disclaimer[
diff --git a/data/skeletons/java-skel.m4 b/data/skeletons/java-skel.m4
index bcc8ebde..0e59220c 100644
--- a/data/skeletons/java-skel.m4
+++ b/data/skeletons/java-skel.m4
@@ -2,7 +2,7 @@
 
 # Java skeleton dispatching for Bison.
 
-# Copyright (C) 2007, 2009-2015, 2018-2020 Free Software Foundation,
+# Copyright (C) 2007, 2009-2015, 2018-2021 Free Software Foundation,
 # Inc.
 
 # This program is free software: you can redistribute it and/or modify
diff --git a/data/skeletons/java.m4 b/data/skeletons/java.m4
index 7b4f7b5c..57a69b78 100644
--- a/data/skeletons/java.m4
+++ b/data/skeletons/java.m4
@@ -2,7 +2,7 @@
 
 # Java language support for Bison
 
-# Copyright (C) 2007-2015, 2018-2020 Free Software Foundation, Inc.
+# Copyright (C) 2007-2015, 2018-2021 Free Software Foundation, Inc.
 
 # This program is free software: you can redistribute it and/or modify
 # it under the terms of the GNU General Public License as published by
diff --git a/data/skeletons/lalr1.cc b/data/skeletons/lalr1.cc
index 5514023a..5240413d 100644
--- a/data/skeletons/lalr1.cc
+++ b/data/skeletons/lalr1.cc
@@ -1,6 +1,6 @@
 # C++ skeleton for Bison
 
-# Copyright (C) 2002-2015, 2018-2020 Free Software Foundation, Inc.
+# Copyright (C) 2002-2015, 2018-2021 Free Software Foundation, Inc.
 
 # This program is free software: you can redistribute it and/or modify
 # it under the terms of the GNU General Public License as published by
@@ -159,7 +159,7 @@ m4_ifdef([b4_lex_param], [, ]b4_lex_param))])])
 
 
 m4_pushdef([b4_copyright_years],
-           [2002-2015, 2018-2020])
+           [2002-2015, 2018-2021])
 
 m4_define([b4_parser_class],
           [b4_percent_define_get([[api.parser.class]])])
diff --git a/data/skeletons/lalr1.d b/data/skeletons/lalr1.d
index 77d1abe2..06d8d405 100644
--- a/data/skeletons/lalr1.d
+++ b/data/skeletons/lalr1.d
@@ -1,6 +1,6 @@
 # D skeleton for Bison -*- autoconf -*-
 
-# Copyright (C) 2007-2012, 2019-2020 Free Software Foundation, Inc.
+# Copyright (C) 2007-2012, 2019-2021 Free Software Foundation, Inc.
 
 # This program is free software: you can redistribute it and/or modify
 # it under the terms of the GNU General Public License as published by
@@ -27,7 +27,7 @@ m4_define([b4_lac_flag],
 
 b4_output_begin([b4_parser_file_name])
 b4_copyright([Skeleton implementation for Bison LALR(1) parsers in D],
-             [2007-2012, 2019-2020])[
+             [2007-2012, 2019-2021])[
 ]b4_disclaimer[
 ]b4_percent_define_ifdef([package], [module b4_percent_define_get([package]);
 ])[
diff --git a/data/skeletons/lalr1.java b/data/skeletons/lalr1.java
index 1db2795d..4f4bf4c3 100644
--- a/data/skeletons/lalr1.java
+++ b/data/skeletons/lalr1.java
@@ -1,6 +1,6 @@
 # Java skeleton for Bison                           -*- java -*-
 
-# Copyright (C) 2007-2015, 2018-2020 Free Software Foundation, Inc.
+# Copyright (C) 2007-2015, 2018-2021 Free Software Foundation, Inc.
 
 # This program is free software: you can redistribute it and/or modify
 # it under the terms of the GNU General Public License as published by
@@ -95,7 +95,7 @@ m4_define([b4_lac_flag],
 
 b4_output_begin([b4_parser_file_name])[
 ]b4_copyright([Skeleton implementation for Bison LALR(1) parsers in Java],
-              [2007-2015, 2018-2020])[
+              [2007-2015, 2018-2021])[
 ]b4_disclaimer[
 ]b4_percent_define_ifdef([api.package], [package b4_percent_define_get([api.package]);[
 ]])[
diff --git a/data/skeletons/location.cc b/data/skeletons/location.cc
index 059c0a8a..b876d288 100644
--- a/data/skeletons/location.cc
+++ b/data/skeletons/location.cc
@@ -1,6 +1,6 @@
 # C++ skeleton for Bison
 
-# Copyright (C) 2002-2015, 2018-2020 Free Software Foundation, Inc.
+# Copyright (C) 2002-2015, 2018-2021 Free Software Foundation, Inc.
 
 # This program is free software: you can redistribute it and/or modify
 # it under the terms of the GNU General Public License as published by
@@ -16,7 +16,7 @@
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
 m4_pushdef([b4_copyright_years],
-           [2002-2015, 2018-2020])
+           [2002-2015, 2018-2021])
 
 
 # b4_position_file
diff --git a/data/skeletons/stack.hh b/data/skeletons/stack.hh
index 7ba9e5f9..1c63ae50 100644
--- a/data/skeletons/stack.hh
+++ b/data/skeletons/stack.hh
@@ -1,6 +1,6 @@
 # C++ skeleton for Bison
 
-# Copyright (C) 2002-2015, 2018-2020 Free Software Foundation, Inc.
+# Copyright (C) 2002-2015, 2018-2021 Free Software Foundation, Inc.
 
 # This program is free software: you can redistribute it and/or modify
 # it under the terms of the GNU General Public License as published by
diff --git a/data/skeletons/variant.hh b/data/skeletons/variant.hh
index 187327cb..ac65c622 100644
--- a/data/skeletons/variant.hh
+++ b/data/skeletons/variant.hh
@@ -1,6 +1,6 @@
 # C++ skeleton for Bison
 
-# Copyright (C) 2002-2015, 2018-2020 Free Software Foundation, Inc.
+# Copyright (C) 2002-2015, 2018-2021 Free Software Foundation, Inc.
 
 # This program is free software: you can redistribute it and/or modify
 # it under the terms of the GNU General Public License as published by
diff --git a/data/skeletons/yacc.c b/data/skeletons/yacc.c
index 739382ce..4f5d4aff 100644
--- a/data/skeletons/yacc.c
+++ b/data/skeletons/yacc.c
@@ -1,11 +1,11 @@
 #                                                            -*- C -*-
 # Yacc compatible skeleton for Bison
 
-# Copyright (C) 1984, 1989-1990, 2000-2015, 2018-2020 Free Software
+# Copyright (C) 1984, 1989-1990, 2000-2015, 2018-2021 Free Software
 # Foundation, Inc.
 
 m4_pushdef([b4_copyright_years],
-           [1984, 1989-1990, 2000-2015, 2018-2020])
+           [1984, 1989-1990, 2000-2015, 2018-2021])
 
 # This program is free software: you can redistribute it and/or modify
 # it under the terms of the GNU General Public License as published by
diff --git a/data/xslt/bison.xsl b/data/xslt/bison.xsl
index d4936959..2cf8d13b 100644
--- a/data/xslt/bison.xsl
+++ b/data/xslt/bison.xsl
@@ -3,7 +3,7 @@
 <!--
     bison.xsl - common templates for Bison XSLT.
 
-    Copyright (C) 2007-2015, 2018-2020 Free Software Foundation, Inc.
+    Copyright (C) 2007-2015, 2018-2021 Free Software Foundation, Inc.
 
     This file is part of Bison, the GNU Compiler Compiler.
 
diff --git a/data/xslt/xml2dot.xsl b/data/xslt/xml2dot.xsl
index a8a5edff..2933358f 100644
--- a/data/xslt/xml2dot.xsl
+++ b/data/xslt/xml2dot.xsl
@@ -3,7 +3,7 @@
 <!--
     xml2dot.xsl - transform Bison XML Report into DOT.
 
-    Copyright (C) 2007-2015, 2018-2020 Free Software Foundation, Inc.
+    Copyright (C) 2007-2015, 2018-2021 Free Software Foundation, Inc.
 
     This file is part of Bison, the GNU Compiler Compiler.
 
diff --git a/data/xslt/xml2text.xsl b/data/xslt/xml2text.xsl
index 6aad1526..a6207480 100644
--- a/data/xslt/xml2text.xsl
+++ b/data/xslt/xml2text.xsl
@@ -3,7 +3,7 @@
 <!--
     xml2text.xsl - transform Bison XML Report into plain text.
 
-    Copyright (C) 2007-2015, 2018-2020 Free Software Foundation, Inc.
+    Copyright (C) 2007-2015, 2018-2021 Free Software Foundation, Inc.
 
     This file is part of Bison, the GNU Compiler Compiler.
 
diff --git a/data/xslt/xml2xhtml.xsl b/data/xslt/xml2xhtml.xsl
index 5fcfda67..e869c1c3 100644
--- a/data/xslt/xml2xhtml.xsl
+++ b/data/xslt/xml2xhtml.xsl
@@ -3,7 +3,7 @@
 <!--
     xml2html.xsl - transform Bison XML Report into XHTML.
 
-    Copyright (C) 2007-2015, 2018-2020 Free Software Foundation, Inc.
+    Copyright (C) 2007-2015, 2018-2021 Free Software Foundation, Inc.
 
     This file is part of Bison, the GNU Compiler Compiler.
 
diff --git a/doc/bison.texi b/doc/bison.texi
index 586dd5ce..c4366960 100644
--- a/doc/bison.texi
+++ b/doc/bison.texi
@@ -173,7 +173,7 @@
 This manual (@value{UPDATED}) is for GNU Bison (version @value{VERSION}),
 the GNU parser generator.
 
-Copyright @copyright{} 1988--1993, 1995, 1998--2015, 2018--2020 Free
+Copyright @copyright{} 1988--1993, 1995, 1998--2015, 2018--2021 Free
 Software Foundation, Inc.
 
 @quotation
@@ -1679,7 +1679,7 @@ after @samp{//}.
 @example
 /* Parser for rpcalc.   -*- C -*-
 
-   Copyright (C) 1988-1993, 1995, 1998-2015, 2018-2020 Free Software
+   Copyright (C) 1988-1993, 1995, 1998-2015, 2018-2021 Free Software
    Foundation, Inc.
 
    This file is part of Bison, the GNU Compiler Compiler.
@@ -2565,7 +2565,7 @@ Here are the C and Bison declarations for the multi-function calculator.
 @example
 /* Parser for mfcalc.   -*- C -*-
 
-   Copyright (C) 1988-1993, 1995, 1998-2015, 2018-2020 Free Software
+   Copyright (C) 1988-1993, 1995, 1998-2015, 2018-2021 Free Software
    Foundation, Inc.
 
    This file is part of Bison, the GNU Compiler Compiler.
@@ -2694,7 +2694,7 @@ provides for either functions or variables to be placed in the table.
 @example
 /* Functions for mfcalc.   -*- C -*-
 
-   Copyright (C) 1988-1993, 1995, 1998-2015, 2018-2020 Free Software
+   Copyright (C) 1988-1993, 1995, 1998-2015, 2018-2021 Free Software
    Foundation, Inc.
 
    This file is part of Bison, the GNU Compiler Compiler.
@@ -12029,7 +12029,7 @@ generate C++.
 @example
 /* Simple variant-based parser.   -*- C++ -*-
 
-   Copyright (C) 2018-2020 Free Software Foundation, Inc.
+   Copyright (C) 2018-2021 Free Software Foundation, Inc.
 
    This file is part of Bison, the GNU Compiler Compiler.
 
@@ -13125,7 +13125,7 @@ library components, and the declaration of the parser class.
 @example
 /* Driver for calc++.   -*- C++ -*-
 
-   Copyright (C) 2005--2015, 2018--2020 Free Software Foundation, Inc.
+   Copyright (C) 2005-2015, 2018-2021 Free Software Foundation, Inc.
 
    This file is part of Bison, the GNU Compiler Compiler.
 
@@ -13221,7 +13221,7 @@ The implementation of the driver (@file{driver.cc}) is straightforward.
 @example
 /* Driver for calc++.   -*- C++ -*-
 
-   Copyright (C) 2005--2015, 2018--2020 Free Software Foundation, Inc.
+   Copyright (C) 2005-2015, 2018-2021 Free Software Foundation, Inc.
 
    This file is part of Bison, the GNU Compiler Compiler.
 
@@ -13288,7 +13288,7 @@ designed the grammar for.
 @example
 /* Parser for calc++.   -*- C++ -*-
 
-   Copyright (C) 2005--2015, 2018--2020 Free Software Foundation, Inc.
+   Copyright (C) 2005-2015, 2018-2021 Free Software Foundation, Inc.
 
    This file is part of Bison, the GNU Compiler Compiler.
 
@@ -13500,7 +13500,7 @@ then the parser's to get the set of defined tokens.
 @example
 /* Scanner for calc++.   -*- C++ -*-
 
-   Copyright (C) 2005--2015, 2018--2020 Free Software Foundation, Inc.
+   Copyright (C) 2005-2015, 2018-2021 Free Software Foundation, Inc.
 
    This file is part of Bison, the GNU Compiler Compiler.
 
@@ -13755,7 +13755,7 @@ The top level file, @file{calc++.cc}, poses no problem.
 @example
 /* Main for calc++.   -*- C++ -*-
 
-   Copyright (C) 2005--2015, 2018--2020 Free Software Foundation, Inc.
+   Copyright (C) 2005-2015, 2018-2021 Free Software Foundation, Inc.
 
    This file is part of Bison, the GNU Compiler Compiler.
 
diff --git a/doc/local.mk b/doc/local.mk
index f5590015..f78501b6 100644
--- a/doc/local.mk
+++ b/doc/local.mk
@@ -1,4 +1,4 @@
-## Copyright (C) 2001-2003, 2005-2015, 2018-2020 Free Software
+## Copyright (C) 2001-2003, 2005-2015, 2018-2021 Free Software
 ## Foundation, Inc.
 
 ## This program is free software: you can redistribute it and/or modify
diff --git a/doc/refcard.tex b/doc/refcard.tex
index 23fd9a61..20cdc067 100644
--- a/doc/refcard.tex
+++ b/doc/refcard.tex
@@ -19,7 +19,7 @@
 \def\finalout{\overfullrule=0pt}
 %\finalout
 
-% Copyright (c) 1998, 2001, 2009--2015, 2018--2020 Free Software
+% Copyright (c) 1998, 2001, 2009--2015, 2018--2021 Free Software
 % Foundation, Inc.
 %
 % This file is part of Bison.
diff --git a/etc/README.md b/etc/README.md
index c7c67b4a..996b640d 100644
--- a/etc/README.md
+++ b/etc/README.md
@@ -22,7 +22,7 @@ fill-column: 76
 ispell-dictionary: "american"
 End:
 
-Copyright (C) 2006, 2009-2015, 2018-2020 Free Software Foundation, Inc.
+Copyright (C) 2006, 2009-2015, 2018-2021 Free Software Foundation, Inc.
 
 This file is part of Bison, the GNU Compiler Compiler.
 
diff --git a/etc/bench.pl.in b/etc/bench.pl.in
index 503ab7b9..d4dfdc8c 100755
--- a/etc/bench.pl.in
+++ b/etc/bench.pl.in
@@ -1,6 +1,6 @@
 #! /usr/bin/perl -w
 
-# Copyright (C) 2006, 2008-2015, 2018-2020 Free Software Foundation,
+# Copyright (C) 2006, 2008-2015, 2018-2021 Free Software Foundation,
 # Inc.
 #
 # This file is part of Bison, the GNU Compiler Compiler.
diff --git a/etc/local.mk b/etc/local.mk
index d03db45f..b62416ea 100644
--- a/etc/local.mk
+++ b/etc/local.mk
@@ -1,4 +1,4 @@
-## Copyright (C) 2006, 2008-2015, 2018-2020 Free Software Foundation,
+## Copyright (C) 2006, 2008-2015, 2018-2021 Free Software Foundation,
 ## Inc.
 
 ## This program is free software: you can redistribute it and/or modify
diff --git a/examples/README.md b/examples/README.md
index bfd14fad..cc467dc0 100644
--- a/examples/README.md
+++ b/examples/README.md
@@ -17,7 +17,7 @@ fill-column: 76
 ispell-dictionary: "american"
 End:
 
-Copyright (C) 2018-2020 Free Software Foundation, Inc.
+Copyright (C) 2018-2021 Free Software Foundation, Inc.
 
 Permission is granted to copy, distribute and/or modify this document
 under the terms of the GNU Free Documentation License, Version 1.3 or
diff --git a/examples/c++/README.md b/examples/c++/README.md
index cbef0021..93cd09d5 100644
--- a/examples/c++/README.md
+++ b/examples/c++/README.md
@@ -46,7 +46,7 @@ fill-column: 76
 ispell-dictionary: "american"
 End:
 
-Copyright (C) 2018-2020 Free Software Foundation, Inc.
+Copyright (C) 2018-2021 Free Software Foundation, Inc.
 
 Permission is granted to copy, distribute and/or modify this document
 under the terms of the GNU Free Documentation License, Version 1.3 or
diff --git a/examples/c++/calc++/README.md b/examples/c++/calc++/README.md
index 2c0a8363..6aaebc2a 100644
--- a/examples/c++/calc++/README.md
+++ b/examples/c++/calc++/README.md
@@ -36,7 +36,7 @@ fill-column: 76
 ispell-dictionary: "american"
 End:
 
-Copyright (C) 2018-2020 Free Software Foundation, Inc.
+Copyright (C) 2018-2021 Free Software Foundation, Inc.
 
 Permission is granted to copy, distribute and/or modify this document
 under the terms of the GNU Free Documentation License, Version 1.3 or
diff --git a/examples/c++/calc++/calc++.test b/examples/c++/calc++/calc++.test
index e00bb466..5e084856 100755
--- a/examples/c++/calc++/calc++.test
+++ b/examples/c++/calc++/calc++.test
@@ -1,6 +1,6 @@
 #! /bin/sh
 
-# Copyright (C) 2005-2015, 2018-2020 Free Software Foundation, Inc.
+# Copyright (C) 2005-2015, 2018-2021 Free Software Foundation, Inc.
 #
 # This program is free software: you can redistribute it and/or modify
 # it under the terms of the GNU General Public License as published by
diff --git a/examples/c++/calc++/local.mk b/examples/c++/calc++/local.mk
index 5cc1ed30..ec753512 100644
--- a/examples/c++/calc++/local.mk
+++ b/examples/c++/calc++/local.mk
@@ -1,4 +1,4 @@
-## Copyright (C) 2005-2006, 2008-2015, 2018-2020 Free Software
+## Copyright (C) 2005-2006, 2008-2015, 2018-2021 Free Software
 ## Foundation, Inc.
 ##
 ## This program is free software: you can redistribute it and/or modify
diff --git a/examples/c++/glr/README.md b/examples/c++/glr/README.md
index 60de8d65..26067c27 100644
--- a/examples/c++/glr/README.md
+++ b/examples/c++/glr/README.md
@@ -10,7 +10,7 @@ fill-column: 76
 ispell-dictionary: "american"
 End:
 
-Copyright (C) 2020 Free Software Foundation, Inc.
+Copyright (C) 2020-2021 Free Software Foundation, Inc.
 
 This file is part of Bison, the GNU Compiler Compiler.
 
diff --git a/examples/c++/glr/ast.hh b/examples/c++/glr/ast.hh
index 3fb0845e..e63af953 100644
--- a/examples/c++/glr/ast.hh
+++ b/examples/c++/glr/ast.hh
@@ -1,5 +1,5 @@
 /*
-  Copyright (C) 2020 Free Software Foundation, Inc.
+  Copyright (C) 2020-2021 Free Software Foundation, Inc.
 
   This program is free software: you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
diff --git a/examples/c++/glr/c++-types.test b/examples/c++/glr/c++-types.test
index 9a3f7506..405541c1 100644
--- a/examples/c++/glr/c++-types.test
+++ b/examples/c++/glr/c++-types.test
@@ -1,6 +1,6 @@
 #! /bin/sh
 
-# Copyright (C) 2020 Free Software Foundation, Inc.
+# Copyright (C) 2020-2021 Free Software Foundation, Inc.
 #
 # This program is free software: you can redistribute it and/or modify
 # it under the terms of the GNU General Public License as published by
diff --git a/examples/c++/glr/c++-types.yy b/examples/c++/glr/c++-types.yy
index c4012a00..94c5b18f 100644
--- a/examples/c++/glr/c++-types.yy
+++ b/examples/c++/glr/c++-types.yy
@@ -1,5 +1,5 @@
 /*                                                       -*- C++ -*-
-  Copyright (C) 2020 Free Software Foundation, Inc.
+  Copyright (C) 2020-2021 Free Software Foundation, Inc.
 
   This program is free software: you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
diff --git a/examples/c++/glr/local.mk b/examples/c++/glr/local.mk
index cd25c3cf..c3faa7b7 100644
--- a/examples/c++/glr/local.mk
+++ b/examples/c++/glr/local.mk
@@ -1,4 +1,4 @@
-## Copyright (C) 2020 Free Software Foundation, Inc.
+## Copyright (C) 2020-2021 Free Software Foundation, Inc.
 ##
 ## This program is free software: you can redistribute it and/or modify
 ## it under the terms of the GNU General Public License as published by
diff --git a/examples/c++/local.mk b/examples/c++/local.mk
index deb4b88f..ecde5555 100644
--- a/examples/c++/local.mk
+++ b/examples/c++/local.mk
@@ -1,4 +1,4 @@
-## Copyright (C) 2018-2020 Free Software Foundation, Inc.
+## Copyright (C) 2018-2021 Free Software Foundation, Inc.
 ##
 ## This program is free software: you can redistribute it and/or modify
 ## it under the terms of the GNU General Public License as published by
diff --git a/examples/c++/variant-11.test b/examples/c++/variant-11.test
index aa39315b..c1e13215 100644
--- a/examples/c++/variant-11.test
+++ b/examples/c++/variant-11.test
@@ -1,6 +1,6 @@
 #! /bin/sh
 
-# Copyright (C) 2018-2020 Free Software Foundation, Inc.
+# Copyright (C) 2018-2021 Free Software Foundation, Inc.
 #
 # This program is free software: you can redistribute it and/or modify
 # it under the terms of the GNU General Public License as published by
diff --git a/examples/c++/variant-11.yy b/examples/c++/variant-11.yy
index 7d883232..adcd7e30 100644
--- a/examples/c++/variant-11.yy
+++ b/examples/c++/variant-11.yy
@@ -1,5 +1,5 @@
 /*
-  Copyright (C) 2008-2015, 2018-2020 Free Software Foundation, Inc.
+  Copyright (C) 2008-2015, 2018-2021 Free Software Foundation, Inc.
 
   This program is free software: you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
diff --git a/examples/c++/variant.test b/examples/c++/variant.test
index 9f77f832..c21bc426 100644
--- a/examples/c++/variant.test
+++ b/examples/c++/variant.test
@@ -1,6 +1,6 @@
 #! /bin/sh
 
-# Copyright (C) 2018-2020 Free Software Foundation, Inc.
+# Copyright (C) 2018-2021 Free Software Foundation, Inc.
 #
 # This program is free software: you can redistribute it and/or modify
 # it under the terms of the GNU General Public License as published by
diff --git a/examples/c++/variant.yy b/examples/c++/variant.yy
index 34527248..a470f83f 100644
--- a/examples/c++/variant.yy
+++ b/examples/c++/variant.yy
@@ -1,5 +1,5 @@
 /*
-  Copyright (C) 2008-2015, 2018-2020 Free Software Foundation, Inc.
+  Copyright (C) 2008-2015, 2018-2021 Free Software Foundation, Inc.
 
   This program is free software: you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
diff --git a/examples/c/README.md b/examples/c/README.md
index 483b77d7..a7561c68 100644
--- a/examples/c/README.md
+++ b/examples/c/README.md
@@ -81,7 +81,7 @@ fill-column: 76
 ispell-dictionary: "american"
 End:
 
-Copyright (C) 2018-2020 Free Software Foundation, Inc.
+Copyright (C) 2018-2021 Free Software Foundation, Inc.
 
 This file is part of GNU bison, the GNU Compiler Compiler.
 
diff --git a/examples/c/bistromathic/README.md b/examples/c/bistromathic/README.md
index d08e91e1..8528e0bd 100644
--- a/examples/c/bistromathic/README.md
+++ b/examples/c/bistromathic/README.md
@@ -32,7 +32,7 @@ fill-column: 76
 ispell-dictionary: "american"
 End:
 
-Copyright (C) 2020 Free Software Foundation, Inc.
+Copyright (C) 2020-2021 Free Software Foundation, Inc.
 
 This file is part of Bison, the GNU Compiler Compiler.
 
diff --git a/examples/c/bistromathic/bistromathic.test b/examples/c/bistromathic/bistromathic.test
index 1a2148da..6aa848ae 100755
--- a/examples/c/bistromathic/bistromathic.test
+++ b/examples/c/bistromathic/bistromathic.test
@@ -1,6 +1,6 @@
 #! /bin/sh
 
-# Copyright (C) 2020 Free Software Foundation, Inc.
+# Copyright (C) 2020-2021 Free Software Foundation, Inc.
 #
 # This program is free software: you can redistribute it and/or modify
 # it under the terms of the GNU General Public License as published by
diff --git a/examples/c/bistromathic/local.mk b/examples/c/bistromathic/local.mk
index e9801ab2..af3bd63a 100644
--- a/examples/c/bistromathic/local.mk
+++ b/examples/c/bistromathic/local.mk
@@ -1,4 +1,4 @@
-## Copyright (C) 2020 Free Software Foundation, Inc.
+## Copyright (C) 2020-2021 Free Software Foundation, Inc.
 ##
 ## This program is free software: you can redistribute it and/or modify
 ## it under the terms of the GNU General Public License as published by
diff --git a/examples/c/bistromathic/parse.y b/examples/c/bistromathic/parse.y
index 37532857..5d5efabf 100644
--- a/examples/c/bistromathic/parse.y
+++ b/examples/c/bistromathic/parse.y
@@ -1,6 +1,6 @@
 /* Parser and scanner for bistromathic.   -*- C -*-
 
-   Copyright (C) 2019-2020 Free Software Foundation, Inc.
+   Copyright (C) 2019-2021 Free Software Foundation, Inc.
 
    This file is part of Bison, the GNU Compiler Compiler.
 
diff --git a/examples/c/calc/README.md b/examples/c/calc/README.md
index e994826f..7cb5282d 100644
--- a/examples/c/calc/README.md
+++ b/examples/c/calc/README.md
@@ -9,7 +9,7 @@ fill-column: 76
 ispell-dictionary: "american"
 End:
 
-Copyright (C) 2019-2020 Free Software Foundation, Inc.
+Copyright (C) 2019-2021 Free Software Foundation, Inc.
 
 This file is part of Bison, the GNU Compiler Compiler.
 
diff --git a/examples/c/calc/calc.test b/examples/c/calc/calc.test
index d778cf75..e4b4a0ce 100644
--- a/examples/c/calc/calc.test
+++ b/examples/c/calc/calc.test
@@ -1,6 +1,6 @@
 #! /bin/sh
 
-# Copyright (C) 2019-2020 Free Software Foundation, Inc.
+# Copyright (C) 2019-2021 Free Software Foundation, Inc.
 #
 # This program is free software: you can redistribute it and/or modify
 # it under the terms of the GNU General Public License as published by
diff --git a/examples/c/calc/local.mk b/examples/c/calc/local.mk
index 503b034a..b9a67e8c 100644
--- a/examples/c/calc/local.mk
+++ b/examples/c/calc/local.mk
@@ -1,4 +1,4 @@
-## Copyright (C) 2019-2020 Free Software Foundation, Inc.
+## Copyright (C) 2019-2021 Free Software Foundation, Inc.
 ##
 ## This program is free software: you can redistribute it and/or modify
 ## it under the terms of the GNU General Public License as published by
diff --git a/examples/c/glr/README.md b/examples/c/glr/README.md
index 60de8d65..26067c27 100644
--- a/examples/c/glr/README.md
+++ b/examples/c/glr/README.md
@@ -10,7 +10,7 @@ fill-column: 76
 ispell-dictionary: "american"
 End:
 
-Copyright (C) 2020 Free Software Foundation, Inc.
+Copyright (C) 2020-2021 Free Software Foundation, Inc.
 
 This file is part of Bison, the GNU Compiler Compiler.
 
diff --git a/examples/c/glr/c++-types.test b/examples/c/glr/c++-types.test
index a476bb86..caf213d2 100644
--- a/examples/c/glr/c++-types.test
+++ b/examples/c/glr/c++-types.test
@@ -1,6 +1,6 @@
 #! /bin/sh
 
-# Copyright (C) 2020 Free Software Foundation, Inc.
+# Copyright (C) 2020-2021 Free Software Foundation, Inc.
 #
 # This program is free software: you can redistribute it and/or modify
 # it under the terms of the GNU General Public License as published by
diff --git a/examples/c/glr/c++-types.y b/examples/c/glr/c++-types.y
index 46fcb171..467ea85f 100644
--- a/examples/c/glr/c++-types.y
+++ b/examples/c/glr/c++-types.y
@@ -1,5 +1,5 @@
 /*                                                       -*- C -*-
-  Copyright (C) 2020 Free Software Foundation, Inc.
+  Copyright (C) 2020-2021 Free Software Foundation, Inc.
 
   This program is free software: you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
diff --git a/examples/c/glr/local.mk b/examples/c/glr/local.mk
index ad68a69b..c6822343 100644
--- a/examples/c/glr/local.mk
+++ b/examples/c/glr/local.mk
@@ -1,4 +1,4 @@
-## Copyright (C) 2020 Free Software Foundation, Inc.
+## Copyright (C) 2020-2021 Free Software Foundation, Inc.
 ##
 ## This program is free software: you can redistribute it and/or modify
 ## it under the terms of the GNU General Public License as published by
diff --git a/examples/c/lexcalc/README.md b/examples/c/lexcalc/README.md
index e0eddedf..2636a21d 100644
--- a/examples/c/lexcalc/README.md
+++ b/examples/c/lexcalc/README.md
@@ -11,7 +11,7 @@ fill-column: 76
 ispell-dictionary: "american"
 End:
 
-Copyright (C) 2018-2020 Free Software Foundation, Inc.
+Copyright (C) 2018-2021 Free Software Foundation, Inc.
 
 This file is part of Bison, the GNU Compiler Compiler.
 
diff --git a/examples/c/lexcalc/lexcalc.test b/examples/c/lexcalc/lexcalc.test
index 0eb4ebee..e6597b0b 100644
--- a/examples/c/lexcalc/lexcalc.test
+++ b/examples/c/lexcalc/lexcalc.test
@@ -1,6 +1,6 @@
 #! /bin/sh
 
-# Copyright (C) 2018-2020 Free Software Foundation, Inc.
+# Copyright (C) 2018-2021 Free Software Foundation, Inc.
 #
 # This program is free software: you can redistribute it and/or modify
 # it under the terms of the GNU General Public License as published by
diff --git a/examples/c/lexcalc/local.mk b/examples/c/lexcalc/local.mk
index 636275c8..af9136ea 100644
--- a/examples/c/lexcalc/local.mk
+++ b/examples/c/lexcalc/local.mk
@@ -1,4 +1,4 @@
-## Copyright (C) 2018-2020 Free Software Foundation, Inc.
+## Copyright (C) 2018-2021 Free Software Foundation, Inc.
 ##
 ## This program is free software: you can redistribute it and/or modify
 ## it under the terms of the GNU General Public License as published by
diff --git a/examples/c/lexcalc/parse.y b/examples/c/lexcalc/parse.y
index 377dbf70..6390a2e1 100644
--- a/examples/c/lexcalc/parse.y
+++ b/examples/c/lexcalc/parse.y
@@ -1,6 +1,6 @@
 /* Parser for lexcalc.   -*- C -*-
 
-   Copyright (C) 2018-2020 Free Software Foundation, Inc.
+   Copyright (C) 2018-2021 Free Software Foundation, Inc.
 
    This file is part of Bison, the GNU Compiler Compiler.
 
diff --git a/examples/c/lexcalc/scan.l b/examples/c/lexcalc/scan.l
index baf0798d..d828ef4f 100644
--- a/examples/c/lexcalc/scan.l
+++ b/examples/c/lexcalc/scan.l
@@ -1,6 +1,6 @@
 /* Scanner for lexcalc.   -*- C -*-
 
-   Copyright (C) 2018-2020 Free Software Foundation, Inc.
+   Copyright (C) 2018-2021 Free Software Foundation, Inc.
 
    This file is part of Bison, the GNU Compiler Compiler.
 
diff --git a/examples/c/local.mk b/examples/c/local.mk
index e0851eb8..4953c28a 100644
--- a/examples/c/local.mk
+++ b/examples/c/local.mk
@@ -1,4 +1,4 @@
-## Copyright (C) 2018-2020 Free Software Foundation, Inc.
+## Copyright (C) 2018-2021 Free Software Foundation, Inc.
 ##
 ## This program is free software: you can redistribute it and/or modify
 ## it under the terms of the GNU General Public License as published by
diff --git a/examples/c/mfcalc/local.mk b/examples/c/mfcalc/local.mk
index 69c91f71..639e9237 100644
--- a/examples/c/mfcalc/local.mk
+++ b/examples/c/mfcalc/local.mk
@@ -1,4 +1,4 @@
-## Copyright (C) 2005-2006, 2008-2015, 2018-2020 Free Software
+## Copyright (C) 2005-2006, 2008-2015, 2018-2021 Free Software
 ## Foundation, Inc.
 ##
 ## This program is free software: you can redistribute it and/or modify
diff --git a/examples/c/mfcalc/mfcalc.test b/examples/c/mfcalc/mfcalc.test
index 2e759ee5..5f599cb0 100755
--- a/examples/c/mfcalc/mfcalc.test
+++ b/examples/c/mfcalc/mfcalc.test
@@ -1,6 +1,6 @@
 #! /bin/sh
 
-# Copyright (C) 2005-2015, 2018-2020 Free Software Foundation, Inc.
+# Copyright (C) 2005-2015, 2018-2021 Free Software Foundation, Inc.
 #
 # This program is free software: you can redistribute it and/or modify
 # it under the terms of the GNU General Public License as published by
diff --git a/examples/c/pushcalc/README.md b/examples/c/pushcalc/README.md
index 4cf6ea7c..8ec1a3a7 100644
--- a/examples/c/pushcalc/README.md
+++ b/examples/c/pushcalc/README.md
@@ -20,7 +20,7 @@ fill-column: 76
 ispell-dictionary: "american"
 End:
 
-Copyright (C) 2020 Free Software Foundation, Inc.
+Copyright (C) 2020-2021 Free Software Foundation, Inc.
 
 Permission is granted to copy, distribute and/or modify this document
 under the terms of the GNU Free Documentation License, Version 1.3 or
diff --git a/examples/c/pushcalc/calc.test b/examples/c/pushcalc/calc.test
index 2241e104..d63761b7 100644
--- a/examples/c/pushcalc/calc.test
+++ b/examples/c/pushcalc/calc.test
@@ -1,6 +1,6 @@
 #! /bin/sh
 
-# Copyright (C) 2020 Free Software Foundation, Inc.
+# Copyright (C) 2020-2021 Free Software Foundation, Inc.
 #
 # This program is free software: you can redistribute it and/or modify
 # it under the terms of the GNU General Public License as published by
diff --git a/examples/c/pushcalc/calc.y b/examples/c/pushcalc/calc.y
index 03ae04c4..08da2841 100644
--- a/examples/c/pushcalc/calc.y
+++ b/examples/c/pushcalc/calc.y
@@ -1,6 +1,6 @@
 /* Parser and scanner for pushcalc.   -*- C -*-
 
-   Copyright (C) 2020 Free Software Foundation, Inc.
+   Copyright (C) 2020-2021 Free Software Foundation, Inc.
 
    This file is part of Bison, the GNU Compiler Compiler.
 
diff --git a/examples/c/pushcalc/local.mk b/examples/c/pushcalc/local.mk
index 7f53a0c1..b02e6dc6 100644
--- a/examples/c/pushcalc/local.mk
+++ b/examples/c/pushcalc/local.mk
@@ -1,4 +1,4 @@
-## Copyright (C) 2020 Free Software Foundation, Inc.
+## Copyright (C) 2020-2021 Free Software Foundation, Inc.
 ##
 ## This program is free software: you can redistribute it and/or modify
 ## it under the terms of the GNU General Public License as published by
diff --git a/examples/c/reccalc/README.md b/examples/c/reccalc/README.md
index 3bfab9e8..b89911af 100644
--- a/examples/c/reccalc/README.md
+++ b/examples/c/reccalc/README.md
@@ -26,7 +26,7 @@ fill-column: 76
 ispell-dictionary: "american"
 End:
 
-Copyright (C) 2018-2020 Free Software Foundation, Inc.
+Copyright (C) 2018-2021 Free Software Foundation, Inc.
 
 Permission is granted to copy, distribute and/or modify this document
 under the terms of the GNU Free Documentation License, Version 1.3 or
diff --git a/examples/c/reccalc/local.mk b/examples/c/reccalc/local.mk
index 41a12828..03511cb4 100644
--- a/examples/c/reccalc/local.mk
+++ b/examples/c/reccalc/local.mk
@@ -1,4 +1,4 @@
-## Copyright (C) 2019-2020 Free Software Foundation, Inc.
+## Copyright (C) 2019-2021 Free Software Foundation, Inc.
 ##
 ## This program is free software: you can redistribute it and/or modify
 ## it under the terms of the GNU General Public License as published by
diff --git a/examples/c/reccalc/parse.y b/examples/c/reccalc/parse.y
index 3d3fbf4d..dc3e6c49 100644
--- a/examples/c/reccalc/parse.y
+++ b/examples/c/reccalc/parse.y
@@ -1,6 +1,6 @@
 /* Parser for reccalc.   -*- C -*-
 
-   Copyright (C) 2019-2020 Free Software Foundation, Inc.
+   Copyright (C) 2019-2021 Free Software Foundation, Inc.
 
    This file is part of Bison, the GNU Compiler Compiler.
 
diff --git a/examples/c/reccalc/reccalc.test b/examples/c/reccalc/reccalc.test
index 124de6bc..ac3bc6d2 100644
--- a/examples/c/reccalc/reccalc.test
+++ b/examples/c/reccalc/reccalc.test
@@ -1,6 +1,6 @@
 #! /bin/sh
 
-# Copyright (C) 2018-2020 Free Software Foundation, Inc.
+# Copyright (C) 2018-2021 Free Software Foundation, Inc.
 #
 # This program is free software: you can redistribute it and/or modify
 # it under the terms of the GNU General Public License as published by
diff --git a/examples/c/reccalc/scan.l b/examples/c/reccalc/scan.l
index 1bf9773e..1775c8ff 100644
--- a/examples/c/reccalc/scan.l
+++ b/examples/c/reccalc/scan.l
@@ -1,6 +1,6 @@
 /* Scanner for reccalc.   -*- C -*-
 
-   Copyright (C) 2019-2020 Free Software Foundation, Inc.
+   Copyright (C) 2019-2021 Free Software Foundation, Inc.
 
    This file is part of Bison, the GNU Compiler Compiler.
 
diff --git a/examples/c/rpcalc/local.mk b/examples/c/rpcalc/local.mk
index 0c3bfd8a..0e36c52e 100644
--- a/examples/c/rpcalc/local.mk
+++ b/examples/c/rpcalc/local.mk
@@ -1,4 +1,4 @@
-## Copyright (C) 2005-2006, 2008-2015, 2018-2020 Free Software
+## Copyright (C) 2005-2006, 2008-2015, 2018-2021 Free Software
 ## Foundation, Inc.
 ##
 ## This program is free software: you can redistribute it and/or modify
diff --git a/examples/c/rpcalc/rpcalc.test b/examples/c/rpcalc/rpcalc.test
index ef2fcfcf..f4905c40 100755
--- a/examples/c/rpcalc/rpcalc.test
+++ b/examples/c/rpcalc/rpcalc.test
@@ -1,6 +1,6 @@
 #! /bin/sh
 
-# Copyright (C) 2005-2015, 2018-2020 Free Software Foundation, Inc.
+# Copyright (C) 2005-2015, 2018-2021 Free Software Foundation, Inc.
 #
 # This program is free software: you can redistribute it and/or modify
 # it under the terms of the GNU General Public License as published by
diff --git a/examples/d/README.md b/examples/d/README.md
index eed3494c..b060648e 100644
--- a/examples/d/README.md
+++ b/examples/d/README.md
@@ -18,7 +18,7 @@ fill-column: 76
 ispell-dictionary: "american"
 End:
 
-Copyright (C) 2018-2020 Free Software Foundation, Inc.
+Copyright (C) 2018-2021 Free Software Foundation, Inc.
 
 Permission is granted to copy, distribute and/or modify this document
 under the terms of the GNU Free Documentation License, Version 1.3 or
diff --git a/examples/d/calc/calc.test b/examples/d/calc/calc.test
index b592d215..3029e8c3 100644
--- a/examples/d/calc/calc.test
+++ b/examples/d/calc/calc.test
@@ -1,6 +1,6 @@
 #! /bin/sh
 
-# Copyright (C) 2018-2020 Free Software Foundation, Inc.
+# Copyright (C) 2018-2021 Free Software Foundation, Inc.
 #
 # This program is free software: you can redistribute it and/or modify
 # it under the terms of the GNU General Public License as published by
diff --git a/examples/d/calc/calc.y b/examples/d/calc/calc.y
index d17ee8d6..832d7788 100644
--- a/examples/d/calc/calc.y
+++ b/examples/d/calc/calc.y
@@ -1,6 +1,6 @@
 /* Parser and scanner for calc in D.   -*- D -*-
 
-   Copyright (C) 2018-2020 Free Software Foundation, Inc.
+   Copyright (C) 2018-2021 Free Software Foundation, Inc.
 
    This file is part of Bison, the GNU Compiler Compiler.
 
diff --git a/examples/d/calc/local.mk b/examples/d/calc/local.mk
index 70b045c4..e2cee511 100644
--- a/examples/d/calc/local.mk
+++ b/examples/d/calc/local.mk
@@ -1,4 +1,4 @@
-## Copyright (C) 2018-2020 Free Software Foundation, Inc.
+## Copyright (C) 2018-2021 Free Software Foundation, Inc.
 ##
 ## This program is free software: you can redistribute it and/or modify
 ## it under the terms of the GNU General Public License as published by
diff --git a/examples/d/local.mk b/examples/d/local.mk
index 9a5d1006..fadb76b7 100644
--- a/examples/d/local.mk
+++ b/examples/d/local.mk
@@ -1,4 +1,4 @@
-## Copyright (C) 2018-2020 Free Software Foundation, Inc.
+## Copyright (C) 2018-2021 Free Software Foundation, Inc.
 ##
 ## This program is free software: you can redistribute it and/or modify
 ## it under the terms of the GNU General Public License as published by
diff --git a/examples/d/simple/calc.test b/examples/d/simple/calc.test
index 6b237592..f9ae88f2 100644
--- a/examples/d/simple/calc.test
+++ b/examples/d/simple/calc.test
@@ -1,6 +1,6 @@
 #! /bin/sh
 
-# Copyright (C) 2018-2020 Free Software Foundation, Inc.
+# Copyright (C) 2018-2021 Free Software Foundation, Inc.
 #
 # This program is free software: you can redistribute it and/or modify
 # it under the terms of the GNU General Public License as published by
diff --git a/examples/d/simple/calc.y b/examples/d/simple/calc.y
index e302036b..7873e71a 100644
--- a/examples/d/simple/calc.y
+++ b/examples/d/simple/calc.y
@@ -1,6 +1,6 @@
 /* Parser and scanner for calc in D.   -*- D -*-
 
-   Copyright (C) 2018-2020 Free Software Foundation, Inc.
+   Copyright (C) 2018-2021 Free Software Foundation, Inc.
 
    This file is part of Bison, the GNU Compiler Compiler.
 
diff --git a/examples/d/simple/local.mk b/examples/d/simple/local.mk
index fb99386a..f9d5a2c7 100644
--- a/examples/d/simple/local.mk
+++ b/examples/d/simple/local.mk
@@ -1,4 +1,4 @@
-## Copyright (C) 2018-2020 Free Software Foundation, Inc.
+## Copyright (C) 2018-2021 Free Software Foundation, Inc.
 ##
 ## This program is free software: you can redistribute it and/or modify
 ## it under the terms of the GNU General Public License as published by
diff --git a/examples/extexi b/examples/extexi
index 5e6ce13d..5c0fcc27 100755
--- a/examples/extexi
+++ b/examples/extexi
@@ -3,7 +3,7 @@
 
 # This file is part of GNU Bison
 
-# Copyright (C) 1992, 2000-2001, 2005-2006, 2009-2015, 2018-2020 Free
+# Copyright (C) 1992, 2000-2001, 2005-2006, 2009-2015, 2018-2021 Free
 # Software Foundation, Inc.
 #
 # This program is free software: you can redistribute it and/or modify
diff --git a/examples/java/README.md b/examples/java/README.md
index 25b7f27c..57b4a6ba 100644
--- a/examples/java/README.md
+++ b/examples/java/README.md
@@ -19,7 +19,7 @@ fill-column: 76
 ispell-dictionary: "american"
 End:
 
-Copyright (C) 2018-2020 Free Software Foundation, Inc.
+Copyright (C) 2018-2021 Free Software Foundation, Inc.
 
 Permission is granted to copy, distribute and/or modify this document
 under the terms of the GNU Free Documentation License, Version 1.3 or
diff --git a/examples/java/calc/Calc.test b/examples/java/calc/Calc.test
index c4143b29..14bea809 100644
--- a/examples/java/calc/Calc.test
+++ b/examples/java/calc/Calc.test
@@ -1,6 +1,6 @@
 #! /bin/sh
 
-# Copyright (C) 2018-2020 Free Software Foundation, Inc.
+# Copyright (C) 2018-2021 Free Software Foundation, Inc.
 #
 # This program is free software: you can redistribute it and/or modify
 # it under the terms of the GNU General Public License as published by
diff --git a/examples/java/calc/Calc.y b/examples/java/calc/Calc.y
index 216b1db6..36315e47 100644
--- a/examples/java/calc/Calc.y
+++ b/examples/java/calc/Calc.y
@@ -1,6 +1,6 @@
 /* Parser and scanner for calc in Java.   -*- Java -*-
 
-   Copyright (C) 2018-2020 Free Software Foundation, Inc.
+   Copyright (C) 2018-2021 Free Software Foundation, Inc.
 
    This file is part of Bison, the GNU Compiler Compiler.
 
diff --git a/examples/java/calc/local.mk b/examples/java/calc/local.mk
index ba370ee5..38b60e2d 100644
--- a/examples/java/calc/local.mk
+++ b/examples/java/calc/local.mk
@@ -1,4 +1,4 @@
-## Copyright (C) 2018-2020 Free Software Foundation, Inc.
+## Copyright (C) 2018-2021 Free Software Foundation, Inc.
 ##
 ## This program is free software: you can redistribute it and/or modify
 ## it under the terms of the GNU General Public License as published by
diff --git a/examples/java/local.mk b/examples/java/local.mk
index 447ae528..077498a0 100644
--- a/examples/java/local.mk
+++ b/examples/java/local.mk
@@ -1,4 +1,4 @@
-## Copyright (C) 2020 Free Software Foundation, Inc.
+## Copyright (C) 2020-2021 Free Software Foundation, Inc.
 ##
 ## This program is free software: you can redistribute it and/or modify
 ## it under the terms of the GNU General Public License as published by
diff --git a/examples/java/simple/Calc.test b/examples/java/simple/Calc.test
index 70494124..3e3bd5b9 100644
--- a/examples/java/simple/Calc.test
+++ b/examples/java/simple/Calc.test
@@ -1,6 +1,6 @@
 #! /bin/sh
 
-# Copyright (C) 2018-2020 Free Software Foundation, Inc.
+# Copyright (C) 2018-2021 Free Software Foundation, Inc.
 #
 # This program is free software: you can redistribute it and/or modify
 # it under the terms of the GNU General Public License as published by
diff --git a/examples/java/simple/Calc.y b/examples/java/simple/Calc.y
index d7b27b96..97776530 100644
--- a/examples/java/simple/Calc.y
+++ b/examples/java/simple/Calc.y
@@ -1,6 +1,6 @@
 /* Simple parser and scanner in Java.   -*- Java -*-
 
-   Copyright (C) 2018-2020 Free Software Foundation, Inc.
+   Copyright (C) 2018-2021 Free Software Foundation, Inc.
 
    This file is part of Bison, the GNU Compiler Compiler.
 
diff --git a/examples/java/simple/local.mk b/examples/java/simple/local.mk
index 8a167d8d..76faa836 100644
--- a/examples/java/simple/local.mk
+++ b/examples/java/simple/local.mk
@@ -1,4 +1,4 @@
-## Copyright (C) 2018-2020 Free Software Foundation, Inc.
+## Copyright (C) 2018-2021 Free Software Foundation, Inc.
 ##
 ## This program is free software: you can redistribute it and/or modify
 ## it under the terms of the GNU General Public License as published by
diff --git a/examples/local.mk b/examples/local.mk
index 51c2c5a2..09e1747b 100644
--- a/examples/local.mk
+++ b/examples/local.mk
@@ -1,4 +1,4 @@
-## Copyright (C) 2005, 2008-2015, 2018-2020 Free Software Foundation,
+## Copyright (C) 2005, 2008-2015, 2018-2021 Free Software Foundation,
 ## Inc.
 ##
 ## This program is free software: you can redistribute it and/or modify
diff --git a/examples/test b/examples/test
index 7590e128..20f54d07 100755
--- a/examples/test
+++ b/examples/test
@@ -1,6 +1,6 @@
 #! /bin/sh
 
-# Copyright (C) 2005-2015, 2018-2020 Free Software Foundation, Inc.
+# Copyright (C) 2005-2015, 2018-2021 Free Software Foundation, Inc.
 #
 # This program is free software: you can redistribute it and/or modify
 # it under the terms of the GNU General Public License as published by
diff --git a/lib/get-errno.c b/lib/get-errno.c
index ef3b71b4..1db3800e 100644
--- a/lib/get-errno.c
+++ b/lib/get-errno.c
@@ -1,6 +1,6 @@
 /* get-errno.c - get and set errno.
 
-   Copyright (C) 2002, 2006, 2009-2015, 2018-2020 Free Software
+   Copyright (C) 2002, 2006, 2009-2015, 2018-2021 Free Software
    Foundation, Inc.
 
    This program is free software: you can redistribute it and/or modify
diff --git a/lib/get-errno.h b/lib/get-errno.h
index b6550852..af761764 100644
--- a/lib/get-errno.h
+++ b/lib/get-errno.h
@@ -1,6 +1,6 @@
 /* get-errno.h - get and set errno.
 
-   Copyright (C) 2002, 2009-2015, 2018-2020 Free Software Foundation,
+   Copyright (C) 2002, 2009-2015, 2018-2021 Free Software Foundation,
    Inc.
 
    This program is free software: you can redistribute it and/or modify
diff --git a/lib/local.mk b/lib/local.mk
index 9e634786..db0b9489 100644
--- a/lib/local.mk
+++ b/lib/local.mk
@@ -1,4 +1,4 @@
-## Copyright (C) 2001-2015, 2018-2020 Free Software Foundation, Inc.
+## Copyright (C) 2001-2015, 2018-2021 Free Software Foundation, Inc.
 ##
 ## This program is free software: you can redistribute it and/or modify
 ## it under the terms of the GNU General Public License as published by
diff --git a/lib/main.c b/lib/main.c
index 4a3015fe..84f84ca0 100644
--- a/lib/main.c
+++ b/lib/main.c
@@ -1,6 +1,6 @@
 /* Yacc library main function.
 
-   Copyright (C) 2002, 2009-2015, 2018-2020 Free Software Foundation,
+   Copyright (C) 2002, 2009-2015, 2018-2021 Free Software Foundation,
    Inc.
 
    This file is part of Bison, the GNU Compiler Compiler.
diff --git a/lib/path-join.c b/lib/path-join.c
index 411f3316..32e7f002 100644
--- a/lib/path-join.c
+++ b/lib/path-join.c
@@ -1,5 +1,5 @@
 /* Concatenate path components.
-   Copyright (C) 2018-2020 Free Software Foundation, Inc.
+   Copyright (C) 2018-2021 Free Software Foundation, Inc.
 
    This program is free software: you can redistribute it and/or modify it
    under the terms of the GNU General Public License as published by the
diff --git a/lib/path-join.h b/lib/path-join.h
index c4444a47..18b6190f 100644
--- a/lib/path-join.h
+++ b/lib/path-join.h
@@ -1,5 +1,5 @@
 /* Concatenate path components.
-   Copyright (C) 2018-2020 Free Software Foundation, Inc.
+   Copyright (C) 2018-2021 Free Software Foundation, Inc.
 
    This program is free software: you can redistribute it and/or modify it
    under the terms of the GNU General Public License as published by the
diff --git a/lib/timevar.def b/lib/timevar.def
index 39eb8405..e24e7eab 100644
--- a/lib/timevar.def
+++ b/lib/timevar.def
@@ -1,7 +1,7 @@
 /* This file contains the definitions for timing variables used to -*- C -*-
    measure run-time performance of the compiler.
 
-   Copyright (C) 2002, 2007, 2009-2015, 2018-2020 Free Software
+   Copyright (C) 2002, 2007, 2009-2015, 2018-2021 Free Software
    Foundation, Inc.
 
    Contributed by Akim Demaille <akim@freefriends.org>.
diff --git a/lib/yyerror.c b/lib/yyerror.c
index 1277ee21..fe25d1fc 100644
--- a/lib/yyerror.c
+++ b/lib/yyerror.c
@@ -1,6 +1,6 @@
 /* Yacc library error-printing function.
 
-   Copyright (C) 2002, 2009-2015, 2018-2020 Free Software Foundation,
+   Copyright (C) 2002, 2009-2015, 2018-2021 Free Software Foundation,
    Inc.
 
    This file is part of Bison, the GNU Compiler Compiler.
diff --git a/m4/bison-check-compiler-flag.m4 b/m4/bison-check-compiler-flag.m4
index d71543ac..fc30a290 100644
--- a/m4/bison-check-compiler-flag.m4
+++ b/m4/bison-check-compiler-flag.m4
@@ -2,7 +2,7 @@
 
 # serial 1
 
-# Copyright (C) 2018-2020 Free Software Foundation, Inc.
+# Copyright (C) 2018-2021 Free Software Foundation, Inc.
 
 # This file is free software; the Free Software Foundation
 # gives unlimited permission to copy and/or distribute it,
diff --git a/m4/bison-cxx-std.m4 b/m4/bison-cxx-std.m4
index 19f52f23..6f6717ae 100644
--- a/m4/bison-cxx-std.m4
+++ b/m4/bison-cxx-std.m4
@@ -1,6 +1,6 @@
 # bison-cxx-std.m4 serial 1
 
-# Copyright (C) 2018-2020 Free Software Foundation, Inc.
+# Copyright (C) 2018-2021 Free Software Foundation, Inc.
 
 # This file is free software; the Free Software Foundation
 # gives unlimited permission to copy and/or distribute it,
diff --git a/m4/bison-i18n.m4 b/m4/bison-i18n.m4
index a531df85..59ab5c47 100644
--- a/m4/bison-i18n.m4
+++ b/m4/bison-i18n.m4
@@ -1,6 +1,6 @@
 # bison-i18n.m4 serial 2
 
-dnl Copyright (C) 2005-2006, 2009-2015, 2018-2020 Free Software
+dnl Copyright (C) 2005-2006, 2009-2015, 2018-2021 Free Software
 dnl Foundation, Inc.
 
 dnl This file is free software; the Free Software Foundation
diff --git a/m4/c-working.m4 b/m4/c-working.m4
index 97f06dcd..81b479a1 100644
--- a/m4/c-working.m4
+++ b/m4/c-working.m4
@@ -1,6 +1,6 @@
 # Sanity test a C compiler.
 
-# Copyright (C) 2006, 2009-2015, 2018-2020 Free Software Foundation,
+# Copyright (C) 2006, 2009-2015, 2018-2021 Free Software Foundation,
 # Inc.
 #
 # This program is free software: you can redistribute it and/or modify
diff --git a/m4/cxx.m4 b/m4/cxx.m4
index c7dd0f90..d7c046fe 100644
--- a/m4/cxx.m4
+++ b/m4/cxx.m4
@@ -1,7 +1,7 @@
 # -*- Autoconf -*-
 # Sanity-test a C++ compiler.
 #
-# Copyright (C) 2004, 2006, 2009-2015, 2018-2020 Free Software
+# Copyright (C) 2004, 2006, 2009-2015, 2018-2021 Free Software
 # Foundation, Inc.
 #
 # This program is free software: you can redistribute it and/or modify
diff --git a/m4/flex.m4 b/m4/flex.m4
index 911a689e..914989cc 100644
--- a/m4/flex.m4
+++ b/m4/flex.m4
@@ -1,5 +1,5 @@
 # flex.m4 serial 2
-# Copyright (C) 2012-2015, 2018-2020 Free Software Foundation, Inc.
+# Copyright (C) 2012-2015, 2018-2021 Free Software Foundation, Inc.
 # This file is free software; the Free Software Foundation
 # gives unlimited permission to copy and/or distribute it,
 # with or without modifications, as long as this notice is preserved.
diff --git a/src/AnnotationList.c b/src/AnnotationList.c
index 92b6690f..ab46551e 100644
--- a/src/AnnotationList.c
+++ b/src/AnnotationList.c
@@ -1,6 +1,6 @@
 /* IELR's inadequacy annotation list.
 
-   Copyright (C) 2009-2015, 2018-2020 Free Software Foundation, Inc.
+   Copyright (C) 2009-2015, 2018-2021 Free Software Foundation, Inc.
 
    This file is part of Bison, the GNU Compiler Compiler.
 
diff --git a/src/AnnotationList.h b/src/AnnotationList.h
index a9f808c5..539e1990 100644
--- a/src/AnnotationList.h
+++ b/src/AnnotationList.h
@@ -1,6 +1,6 @@
 /* IELR's inadequacy annotation list.
 
-   Copyright (C) 2009-2015, 2018-2020 Free Software Foundation, Inc.
+   Copyright (C) 2009-2015, 2018-2021 Free Software Foundation, Inc.
 
    This file is part of Bison, the GNU Compiler Compiler.
 
diff --git a/src/InadequacyList.c b/src/InadequacyList.c
index 6d7f1922..d9ae9a3e 100644
--- a/src/InadequacyList.c
+++ b/src/InadequacyList.c
@@ -1,6 +1,6 @@
 /* IELR's inadequacy list.
 
-   Copyright (C) 2009-2015, 2018-2020 Free Software Foundation, Inc.
+   Copyright (C) 2009-2015, 2018-2021 Free Software Foundation, Inc.
 
    This file is part of Bison, the GNU Compiler Compiler.
 
diff --git a/src/InadequacyList.h b/src/InadequacyList.h
index 317d9d5a..29866198 100644
--- a/src/InadequacyList.h
+++ b/src/InadequacyList.h
@@ -1,6 +1,6 @@
 /* IELR's inadequacy list.
 
-   Copyright (C) 2009-2015, 2018-2020 Free Software Foundation, Inc.
+   Copyright (C) 2009-2015, 2018-2021 Free Software Foundation, Inc.
 
    This file is part of Bison, the GNU Compiler Compiler.
 
diff --git a/src/Sbitset.c b/src/Sbitset.c
index 3b165103..03d74836 100644
--- a/src/Sbitset.c
+++ b/src/Sbitset.c
@@ -1,6 +1,6 @@
 /* A simple, memory-efficient bitset implementation.
 
-   Copyright (C) 2009-2015, 2018-2020 Free Software Foundation, Inc.
+   Copyright (C) 2009-2015, 2018-2021 Free Software Foundation, Inc.
 
    This file is part of Bison, the GNU Compiler Compiler.
 
diff --git a/src/Sbitset.h b/src/Sbitset.h
index c54def4e..6814ba8f 100644
--- a/src/Sbitset.h
+++ b/src/Sbitset.h
@@ -1,6 +1,6 @@
 /* A simple, memory-efficient bitset implementation.
 
-   Copyright (C) 2009-2015, 2018-2020 Free Software Foundation, Inc.
+   Copyright (C) 2009-2015, 2018-2021 Free Software Foundation, Inc.
 
    This file is part of Bison, the GNU Compiler Compiler.
 
diff --git a/src/assoc.c b/src/assoc.c
index 0c3de26f..7337c0a3 100644
--- a/src/assoc.c
+++ b/src/assoc.c
@@ -1,6 +1,6 @@
 /* Associativity information.
 
-   Copyright (C) 2002, 2005-2006, 2008-2015, 2018-2020 Free Software
+   Copyright (C) 2002, 2005-2006, 2008-2015, 2018-2021 Free Software
    Foundation, Inc.
 
    This file is part of Bison, the GNU Compiler Compiler.
diff --git a/src/assoc.h b/src/assoc.h
index 9fdbb466..1b4b7f31 100644
--- a/src/assoc.h
+++ b/src/assoc.h
@@ -1,6 +1,6 @@
 /* Associativity information.
 
-   Copyright (C) 2002, 2006, 2008-2015, 2018-2020 Free Software
+   Copyright (C) 2002, 2006, 2008-2015, 2018-2021 Free Software
    Foundation, Inc.
 
    This file is part of Bison, the GNU Compiler Compiler.
diff --git a/src/closure.c b/src/closure.c
index 1ea77ee6..a85d5e44 100644
--- a/src/closure.c
+++ b/src/closure.c
@@ -1,7 +1,7 @@
 /* Closures for Bison
 
    Copyright (C) 1984, 1989, 2000-2002, 2004-2005, 2007, 2009-2015,
-   2018-2020 Free Software Foundation, Inc.
+   2018-2021 Free Software Foundation, Inc.
 
    This file is part of Bison, the GNU Compiler Compiler.
 
diff --git a/src/closure.h b/src/closure.h
index 8fa1ed60..2d426ae5 100644
--- a/src/closure.h
+++ b/src/closure.h
@@ -1,6 +1,6 @@
 /* Subroutines for bison
 
-   Copyright (C) 1984, 1989, 2000-2002, 2007, 2009-2015, 2018-2020 Free
+   Copyright (C) 1984, 1989, 2000-2002, 2007, 2009-2015, 2018-2021 Free
    Software Foundation, Inc.
 
    This file is part of Bison, the GNU Compiler Compiler.
diff --git a/src/complain.c b/src/complain.c
index b17b8e60..6a0723d4 100644
--- a/src/complain.c
+++ b/src/complain.c
@@ -1,6 +1,6 @@
 /* Declaration for error-reporting function for Bison.
 
-   Copyright (C) 2000-2002, 2004-2006, 2009-2015, 2018-2020 Free
+   Copyright (C) 2000-2002, 2004-2006, 2009-2015, 2018-2021 Free
    Software Foundation, Inc.
 
    This program is free software: you can redistribute it and/or modify
diff --git a/src/complain.h b/src/complain.h
index 303d0a54..9be0d052 100644
--- a/src/complain.h
+++ b/src/complain.h
@@ -1,6 +1,6 @@
 /* Declaration for error-reporting function for Bison.
 
-   Copyright (C) 2000-2002, 2006, 2009-2015, 2018-2020 Free Software
+   Copyright (C) 2000-2002, 2006, 2009-2015, 2018-2021 Free Software
    Foundation, Inc.
 
    This program is free software: you can redistribute it and/or modify
diff --git a/src/conflicts.c b/src/conflicts.c
index b7280be7..729a5ddd 100644
--- a/src/conflicts.c
+++ b/src/conflicts.c
@@ -1,6 +1,6 @@
 /* Find and resolve or report lookahead conflicts for bison,
 
-   Copyright (C) 1984, 1989, 1992, 2000-2015, 2018-2020 Free Software
+   Copyright (C) 1984, 1989, 1992, 2000-2015, 2018-2021 Free Software
    Foundation, Inc.
 
    This file is part of Bison, the GNU Compiler Compiler.
diff --git a/src/conflicts.h b/src/conflicts.h
index d4e679f0..40b843cc 100644
--- a/src/conflicts.h
+++ b/src/conflicts.h
@@ -1,6 +1,6 @@
 /* Find and resolve or report lookahead conflicts for bison,
 
-   Copyright (C) 2000-2002, 2004, 2007, 2009-2015, 2018-2020 Free
+   Copyright (C) 2000-2002, 2004, 2007, 2009-2015, 2018-2021 Free
    Software Foundation, Inc.
 
    This file is part of Bison, the GNU Compiler Compiler.
diff --git a/src/counterexample.c b/src/counterexample.c
index 8cf56135..23921c58 100644
--- a/src/counterexample.c
+++ b/src/counterexample.c
@@ -1,6 +1,6 @@
 /* Conflict counterexample generation
 
-   Copyright (C) 2020 Free Software Foundation, Inc.
+   Copyright (C) 2020-2021 Free Software Foundation, Inc.
 
    This file is part of Bison, the GNU Compiler Compiler.
 
diff --git a/src/counterexample.h b/src/counterexample.h
index 735828fa..bf8b5573 100644
--- a/src/counterexample.h
+++ b/src/counterexample.h
@@ -1,6 +1,6 @@
 /* Conflict counterexample generation
 
-   Copyright (C) 2020 Free Software Foundation, Inc.
+   Copyright (C) 2020-2021 Free Software Foundation, Inc.
 
    This file is part of Bison, the GNU Compiler Compiler.
 
diff --git a/src/derivation.c b/src/derivation.c
index 433f504e..9ed1d0f1 100644
--- a/src/derivation.c
+++ b/src/derivation.c
@@ -1,6 +1,6 @@
 /* Counterexample derivation trees
 
-   Copyright (C) 2020 Free Software Foundation, Inc.
+   Copyright (C) 2020-2021 Free Software Foundation, Inc.
 
    This file is part of Bison, the GNU Compiler Compiler.
 
diff --git a/src/derivation.h b/src/derivation.h
index 3f376642..b9b531ba 100644
--- a/src/derivation.h
+++ b/src/derivation.h
@@ -1,6 +1,6 @@
 /* Counterexample derivation trees
 
-   Copyright (C) 2020 Free Software Foundation, Inc.
+   Copyright (C) 2020-2021 Free Software Foundation, Inc.
 
    This file is part of Bison, the GNU Compiler Compiler.
 
diff --git a/src/derives.c b/src/derives.c
index f0d334c7..9411f35b 100644
--- a/src/derives.c
+++ b/src/derives.c
@@ -1,6 +1,6 @@
 /* Match rules with nonterminals for bison,
 
-   Copyright (C) 1984, 1989, 2000-2003, 2005, 2009-2015, 2018-2020 Free
+   Copyright (C) 1984, 1989, 2000-2003, 2005, 2009-2015, 2018-2021 Free
    Software Foundation, Inc.
 
    This file is part of Bison, the GNU Compiler Compiler.
diff --git a/src/derives.h b/src/derives.h
index 33430e6f..8df5419d 100644
--- a/src/derives.h
+++ b/src/derives.h
@@ -1,6 +1,6 @@
 /* Match rules with nonterminals for bison,
 
-   Copyright (C) 1984, 1989, 2000-2002, 2009-2015, 2018-2020 Free
+   Copyright (C) 1984, 1989, 2000-2002, 2009-2015, 2018-2021 Free
    Software Foundation, Inc.
 
    This file is part of Bison, the GNU Compiler Compiler.
diff --git a/src/files.c b/src/files.c
index 1cf04c51..78daf73a 100644
--- a/src/files.c
+++ b/src/files.c
@@ -1,6 +1,6 @@
 /* Open and close files for Bison.
 
-   Copyright (C) 1984, 1986, 1989, 1992, 2000-2015, 2018-2020 Free
+   Copyright (C) 1984, 1986, 1989, 1992, 2000-2015, 2018-2021 Free
    Software Foundation, Inc.
 
    This file is part of Bison, the GNU Compiler Compiler.
diff --git a/src/files.h b/src/files.h
index 5d3ee8fa..675aaac9 100644
--- a/src/files.h
+++ b/src/files.h
@@ -1,6 +1,6 @@
 /* File names and variables for bison,
 
-   Copyright (C) 1984, 1989, 2000-2002, 2006-2007, 2009-2015, 2018-2020
+   Copyright (C) 1984, 1989, 2000-2002, 2006-2007, 2009-2015, 2018-2021
    Free Software Foundation, Inc.
 
    This file is part of Bison, the GNU Compiler Compiler.
diff --git a/src/fixits.c b/src/fixits.c
index 701d2ad4..610fcb65 100644
--- a/src/fixits.c
+++ b/src/fixits.c
@@ -1,6 +1,6 @@
 /* Support for fixing grammar files.
 
-   Copyright (C) 2019-2020 Free Software Foundation, Inc.
+   Copyright (C) 2019-2021 Free Software Foundation, Inc.
 
    This file is part of Bison, the GNU Compiler Compiler.
 
diff --git a/src/fixits.h b/src/fixits.h
index f79217a3..a4ac44c3 100644
--- a/src/fixits.h
+++ b/src/fixits.h
@@ -1,6 +1,6 @@
 /* Support for fixing grammar files.
 
-   Copyright (C) 2019-2020 Free Software Foundation, Inc.
+   Copyright (C) 2019-2021 Free Software Foundation, Inc.
 
    This program is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
diff --git a/src/flex-scanner.h b/src/flex-scanner.h
index 2acc9146..08e6978e 100644
--- a/src/flex-scanner.h
+++ b/src/flex-scanner.h
@@ -1,6 +1,6 @@
 /* Common parts between scan-code.l, scan-gram.l, and scan-skel.l.
 
-   Copyright (C) 2006, 2009-2015, 2018-2020 Free Software Foundation,
+   Copyright (C) 2006, 2009-2015, 2018-2021 Free Software Foundation,
    Inc.
 
    This file is part of Bison, the GNU Compiler Compiler.
diff --git a/src/getargs.c b/src/getargs.c
index dc7b7915..3f6d65e0 100644
--- a/src/getargs.c
+++ b/src/getargs.c
@@ -1,6 +1,6 @@
 /* Parse command line arguments for Bison.
 
-   Copyright (C) 1984, 1986, 1989, 1992, 2000-2015, 2018-2020 Free
+   Copyright (C) 1984, 1986, 1989, 1992, 2000-2015, 2018-2021 Free
    Software Foundation, Inc.
 
    This file is part of Bison, the GNU Compiler Compiler.
diff --git a/src/getargs.h b/src/getargs.h
index 9e78d074..f4d08ee7 100644
--- a/src/getargs.h
+++ b/src/getargs.h
@@ -1,6 +1,6 @@
 /* Parse command line arguments for bison.
 
-   Copyright (C) 1984, 1986, 1989, 1992, 2000-2015, 2018-2020 Free
+   Copyright (C) 1984, 1986, 1989, 1992, 2000-2015, 2018-2021 Free
    Software Foundation, Inc.
 
    This file is part of Bison, the GNU Compiler Compiler.
diff --git a/src/glyphs.c b/src/glyphs.c
index dcd7f0c7..898781af 100644
--- a/src/glyphs.c
+++ b/src/glyphs.c
@@ -1,6 +1,6 @@
 /* Graphical symbols.
 
-   Copyright (C) 2020 Free Software Foundation, Inc.
+   Copyright (C) 2020-2021 Free Software Foundation, Inc.
 
    This file is part of Bison, the GNU Compiler Compiler.
 
diff --git a/src/glyphs.h b/src/glyphs.h
index 0af7e23c..ceee68f1 100644
--- a/src/glyphs.h
+++ b/src/glyphs.h
@@ -1,6 +1,6 @@
 /* Graphical symbols.
 
-   Copyright (C) 2020 Free Software Foundation, Inc.
+   Copyright (C) 2020-2021 Free Software Foundation, Inc.
 
    This file is part of Bison, the GNU Compiler Compiler.
 
diff --git a/src/gram.c b/src/gram.c
index d20441b8..95dd8221 100644
--- a/src/gram.c
+++ b/src/gram.c
@@ -1,6 +1,6 @@
 /* Allocate input grammar variables for Bison.
 
-   Copyright (C) 1984, 1986, 1989, 2001-2003, 2005-2015, 2018-2020 Free
+   Copyright (C) 1984, 1986, 1989, 2001-2003, 2005-2015, 2018-2021 Free
    Software Foundation, Inc.
 
    This file is part of Bison, the GNU Compiler Compiler.
diff --git a/src/gram.h b/src/gram.h
index db874e24..1fc08cfe 100644
--- a/src/gram.h
+++ b/src/gram.h
@@ -1,6 +1,6 @@
 /* Data definitions for internal representation of Bison's input.
 
-   Copyright (C) 1984, 1986, 1989, 1992, 2001-2007, 2009-2015, 2018-2020
+   Copyright (C) 1984, 1986, 1989, 1992, 2001-2007, 2009-2015, 2018-2021
    Free Software Foundation, Inc.
 
    This file is part of Bison, the GNU Compiler Compiler.
diff --git a/src/graphviz.c b/src/graphviz.c
index da4db481..327b81d6 100644
--- a/src/graphviz.c
+++ b/src/graphviz.c
@@ -1,6 +1,6 @@
 /* Output Graphviz specification of a state machine generated by Bison.
 
-   Copyright (C) 2006-2007, 2009-2015, 2018-2020 Free Software
+   Copyright (C) 2006-2007, 2009-2015, 2018-2021 Free Software
    Foundation, Inc.
 
    This file is part of Bison, the GNU Compiler Compiler.
diff --git a/src/graphviz.h b/src/graphviz.h
index ead22ffd..efad8471 100644
--- a/src/graphviz.h
+++ b/src/graphviz.h
@@ -1,6 +1,6 @@
 /* Output Graphviz specification of a state machine generated by Bison.
 
-   Copyright (C) 2006, 2010-2015, 2018-2020 Free Software Foundation,
+   Copyright (C) 2006, 2010-2015, 2018-2021 Free Software Foundation,
    Inc.
 
    This file is part of Bison, the GNU Compiler Compiler.
diff --git a/src/ielr.c b/src/ielr.c
index 3f7fb3ff..b5216d08 100644
--- a/src/ielr.c
+++ b/src/ielr.c
@@ -1,6 +1,6 @@
 /* IELR main implementation.
 
-   Copyright (C) 2009-2015, 2018-2020 Free Software Foundation, Inc.
+   Copyright (C) 2009-2015, 2018-2021 Free Software Foundation, Inc.
 
    This file is part of Bison, the GNU Compiler Compiler.
 
diff --git a/src/ielr.h b/src/ielr.h
index bb62625a..9b3cf470 100644
--- a/src/ielr.h
+++ b/src/ielr.h
@@ -1,6 +1,6 @@
 /* IELR main implementation.
 
-   Copyright (C) 2009-2015, 2018-2020 Free Software Foundation, Inc.
+   Copyright (C) 2009-2015, 2018-2021 Free Software Foundation, Inc.
 
    This file is part of Bison, the GNU Compiler Compiler.
 
diff --git a/src/lalr.c b/src/lalr.c
index 8a89d49e..0f56c74a 100644
--- a/src/lalr.c
+++ b/src/lalr.c
@@ -1,6 +1,6 @@
 /* Compute lookahead criteria for Bison.
 
-   Copyright (C) 1984, 1986, 1989, 2000-2015, 2018-2020 Free Software
+   Copyright (C) 1984, 1986, 1989, 2000-2015, 2018-2021 Free Software
    Foundation, Inc.
 
    This file is part of Bison, the GNU Compiler Compiler.
diff --git a/src/lalr.h b/src/lalr.h
index f94123a4..1f743d45 100644
--- a/src/lalr.h
+++ b/src/lalr.h
@@ -1,7 +1,7 @@
 /* Compute lookahead criteria for bison,
 
    Copyright (C) 1984, 1986, 1989, 2000, 2002, 2004, 2006-2007,
-   2009-2015, 2018-2020 Free Software Foundation, Inc.
+   2009-2015, 2018-2021 Free Software Foundation, Inc.
 
    This file is part of Bison, the GNU Compiler Compiler.
 
diff --git a/src/local.mk b/src/local.mk
index 08ff62be..11e8d458 100644
--- a/src/local.mk
+++ b/src/local.mk
@@ -1,4 +1,4 @@
-## Copyright (C) 2001-2015, 2018-2020 Free Software Foundation, Inc.
+## Copyright (C) 2001-2015, 2018-2021 Free Software Foundation, Inc.
 ##
 ## This program is free software: you can redistribute it and/or modify
 ## it under the terms of the GNU General Public License as published by
diff --git a/src/location.c b/src/location.c
index 418a728d..7d96cc86 100644
--- a/src/location.c
+++ b/src/location.c
@@ -1,6 +1,6 @@
 /* Locations for Bison
 
-   Copyright (C) 2002, 2005-2015, 2018-2020 Free Software Foundation,
+   Copyright (C) 2002, 2005-2015, 2018-2021 Free Software Foundation,
    Inc.
 
    This file is part of Bison, the GNU Compiler Compiler.
diff --git a/src/location.h b/src/location.h
index d351cb0e..65c75f00 100644
--- a/src/location.h
+++ b/src/location.h
@@ -1,6 +1,6 @@
 /* Locations for Bison
 
-   Copyright (C) 2002, 2004-2015, 2018-2020 Free Software Foundation,
+   Copyright (C) 2002, 2004-2015, 2018-2021 Free Software Foundation,
    Inc.
 
    This file is part of Bison, the GNU Compiler Compiler.
diff --git a/src/lr0.c b/src/lr0.c
index 90264632..0be80920 100644
--- a/src/lr0.c
+++ b/src/lr0.c
@@ -1,6 +1,6 @@
 /* Generate the LR(0) parser states for Bison.
 
-   Copyright (C) 1984, 1986, 1989, 2000-2002, 2004-2015, 2018-2020 Free
+   Copyright (C) 1984, 1986, 1989, 2000-2002, 2004-2015, 2018-2021 Free
    Software Foundation, Inc.
 
    This file is part of Bison, the GNU Compiler Compiler.
diff --git a/src/lr0.h b/src/lr0.h
index 31366dbd..0daf7f71 100644
--- a/src/lr0.h
+++ b/src/lr0.h
@@ -1,6 +1,6 @@
 /* Generate the LR(0) parser states for Bison.
 
-   Copyright (C) 1984, 1986, 1989, 2000-2002, 2009-2015, 2018-2020 Free
+   Copyright (C) 1984, 1986, 1989, 2000-2002, 2009-2015, 2018-2021 Free
    Software Foundation, Inc.
 
    This file is part of Bison, the GNU Compiler Compiler.
diff --git a/src/lssi.c b/src/lssi.c
index 44dd819b..245461a9 100644
--- a/src/lssi.c
+++ b/src/lssi.c
@@ -1,6 +1,6 @@
 /* Lookahead sensitive state item searches for counterexample generation
 
-   Copyright (C) 2020 Free Software Foundation, Inc.
+   Copyright (C) 2020-2021 Free Software Foundation, Inc.
 
    This file is part of Bison, the GNU Compiler Compiler.
 
diff --git a/src/lssi.h b/src/lssi.h
index 6aaf2bc4..cbb53f8d 100644
--- a/src/lssi.h
+++ b/src/lssi.h
@@ -1,6 +1,6 @@
 /* Lookahead sensitive state item searches for counterexample generation
 
-   Copyright (C) 2020 Free Software Foundation, Inc.
+   Copyright (C) 2020-2021 Free Software Foundation, Inc.
 
    This file is part of Bison, the GNU Compiler Compiler.
 
diff --git a/src/main.c b/src/main.c
index 56ca2848..54986877 100644
--- a/src/main.c
+++ b/src/main.c
@@ -1,7 +1,7 @@
 /* Top level entry point of Bison.
 
    Copyright (C) 1984, 1986, 1989, 1992, 1995, 2000-2002, 2004-2015,
-   2018-2020 Free Software Foundation, Inc.
+   2018-2021 Free Software Foundation, Inc.
 
    This file is part of Bison, the GNU Compiler Compiler.
 
diff --git a/src/muscle-tab.c b/src/muscle-tab.c
index c0c66690..c2ba2ab6 100644
--- a/src/muscle-tab.c
+++ b/src/muscle-tab.c
@@ -1,6 +1,6 @@
 /* Muscle table manager for Bison.
 
-   Copyright (C) 2001-2015, 2018-2020 Free Software Foundation, Inc.
+   Copyright (C) 2001-2015, 2018-2021 Free Software Foundation, Inc.
 
    This file is part of Bison, the GNU Compiler Compiler.
 
diff --git a/src/muscle-tab.h b/src/muscle-tab.h
index a0dd2020..30b50f9f 100644
--- a/src/muscle-tab.h
+++ b/src/muscle-tab.h
@@ -1,6 +1,6 @@
 /* Muscle table manager for Bison,
 
-   Copyright (C) 2001-2003, 2006-2015, 2018-2020 Free Software
+   Copyright (C) 2001-2003, 2006-2015, 2018-2021 Free Software
    Foundation, Inc.
 
    This file is part of Bison, the GNU Compiler Compiler.
diff --git a/src/named-ref.c b/src/named-ref.c
index 6e639ac2..7a81456e 100644
--- a/src/named-ref.c
+++ b/src/named-ref.c
@@ -1,6 +1,6 @@
 /* Named symbol references for Bison
 
-   Copyright (C) 2009-2015, 2018-2020 Free Software Foundation, Inc.
+   Copyright (C) 2009-2015, 2018-2021 Free Software Foundation, Inc.
 
    This file is part of Bison, the GNU Compiler Compiler.
 
diff --git a/src/named-ref.h b/src/named-ref.h
index 250c713f..6a838122 100644
--- a/src/named-ref.h
+++ b/src/named-ref.h
@@ -1,6 +1,6 @@
 /* Named symbol references for Bison
 
-   Copyright (C) 2009-2015, 2018-2020 Free Software Foundation, Inc.
+   Copyright (C) 2009-2015, 2018-2021 Free Software Foundation, Inc.
 
    This file is part of Bison, the GNU Compiler Compiler.
 
diff --git a/src/nullable.c b/src/nullable.c
index d982987f..8661000b 100644
--- a/src/nullable.c
+++ b/src/nullable.c
@@ -1,6 +1,6 @@
 /* Calculate which nonterminals can expand into the null string for Bison.
 
-   Copyright (C) 1984, 1989, 2000-2006, 2009-2015, 2018-2020 Free
+   Copyright (C) 1984, 1989, 2000-2006, 2009-2015, 2018-2021 Free
    Software Foundation, Inc.
 
    This file is part of Bison, the GNU Compiler Compiler.
diff --git a/src/nullable.h b/src/nullable.h
index 236c5054..4d02c759 100644
--- a/src/nullable.h
+++ b/src/nullable.h
@@ -1,6 +1,6 @@
 /* Part of the bison parser generator,
 
-   Copyright (C) 2000, 2002, 2009-2015, 2018-2020 Free Software
+   Copyright (C) 2000, 2002, 2009-2015, 2018-2021 Free Software
    Foundation, Inc.
 
    This file is part of Bison, the GNU Compiler Compiler.
diff --git a/src/output.c b/src/output.c
index e31f9332..ced4553d 100644
--- a/src/output.c
+++ b/src/output.c
@@ -1,6 +1,6 @@
 /* Output the generated parsing program for Bison.
 
-   Copyright (C) 1984, 1986, 1989, 1992, 2000-2015, 2018-2020 Free
+   Copyright (C) 1984, 1986, 1989, 1992, 2000-2015, 2018-2021 Free
    Software Foundation, Inc.
 
    This file is part of Bison, the GNU Compiler Compiler.
diff --git a/src/output.h b/src/output.h
index 64101306..45172f54 100644
--- a/src/output.h
+++ b/src/output.h
@@ -1,6 +1,6 @@
 /* Output the generated parsing program for bison,
 
-   Copyright (C) 2000-2003, 2006-2007, 2009-2015, 2018-2020 Free
+   Copyright (C) 2000-2003, 2006-2007, 2009-2015, 2018-2021 Free
    Software Foundation, Inc.
 
    This file is part of Bison, the GNU Compiler Compiler.
diff --git a/src/parse-gram.c b/src/parse-gram.c
index 4b1183bc..d92cde6c 100644
--- a/src/parse-gram.c
+++ b/src/parse-gram.c
@@ -2,7 +2,7 @@
 
 /* Bison implementation for Yacc-like parsers in C
 
-   Copyright (C) 1984, 1989-1990, 2000-2015, 2018-2020 Free Software Foundation,
+   Copyright (C) 1984, 1989-1990, 2000-2015, 2018-2021 Free Software Foundation,
    Inc.
 
    This program is free software: you can redistribute it and/or modify
diff --git a/src/parse-gram.h b/src/parse-gram.h
index 6138bbc9..7968e4fa 100644
--- a/src/parse-gram.h
+++ b/src/parse-gram.h
@@ -2,7 +2,7 @@
 
 /* Bison interface for Yacc-like parsers in C
 
-   Copyright (C) 1984, 1989-1990, 2000-2015, 2018-2020 Free Software Foundation,
+   Copyright (C) 1984, 1989-1990, 2000-2015, 2018-2021 Free Software Foundation,
    Inc.
 
    This program is free software: you can redistribute it and/or modify
diff --git a/src/parse-gram.y b/src/parse-gram.y
index 5fa2a3ad..02ba5093 100644
--- a/src/parse-gram.y
+++ b/src/parse-gram.y
@@ -1,6 +1,6 @@
 /* Bison Grammar Parser                             -*- C -*-
 
-   Copyright (C) 2002-2015, 2018-2020 Free Software Foundation, Inc.
+   Copyright (C) 2002-2015, 2018-2021 Free Software Foundation, Inc.
 
    This file is part of Bison, the GNU Compiler Compiler.
 
diff --git a/src/parse-simulation.c b/src/parse-simulation.c
index 41d5e583..984779fd 100644
--- a/src/parse-simulation.c
+++ b/src/parse-simulation.c
@@ -1,6 +1,6 @@
 /* Parser simulator for unifying counterexample search
 
-   Copyright (C) 2020 Free Software Foundation, Inc.
+   Copyright (C) 2020-2021 Free Software Foundation, Inc.
 
    This file is part of Bison, the GNU Compiler Compiler.
 
diff --git a/src/parse-simulation.h b/src/parse-simulation.h
index 92eea21c..0331a321 100644
--- a/src/parse-simulation.h
+++ b/src/parse-simulation.h
@@ -1,6 +1,6 @@
 /* Parser simulator for unifying counterexample search
 
-   Copyright (C) 2020 Free Software Foundation, Inc.
+   Copyright (C) 2020-2021 Free Software Foundation, Inc.
 
    This file is part of Bison, the GNU Compiler Compiler.
 
diff --git a/src/print-graph.c b/src/print-graph.c
index 48836f26..379093ad 100644
--- a/src/print-graph.c
+++ b/src/print-graph.c
@@ -1,6 +1,6 @@
 /* Output a graph of the generated parser, for Bison.
 
-   Copyright (C) 2001-2007, 2009-2015, 2018-2020 Free Software
+   Copyright (C) 2001-2007, 2009-2015, 2018-2021 Free Software
    Foundation, Inc.
 
    This file is part of Bison, the GNU Compiler Compiler.
diff --git a/src/print-graph.h b/src/print-graph.h
index c31a5ca2..78f83f15 100644
--- a/src/print-graph.h
+++ b/src/print-graph.h
@@ -1,6 +1,6 @@
 /* Output a graph of the generated parser, for Bison.
 
-   Copyright (C) 2000, 2006, 2009-2015, 2018-2020 Free Software
+   Copyright (C) 2000, 2006, 2009-2015, 2018-2021 Free Software
    Foundation, Inc.
 
    This file is part of Bison, the GNU Compiler Compiler.
diff --git a/src/print-xml.c b/src/print-xml.c
index 049b678f..ace02885 100644
--- a/src/print-xml.c
+++ b/src/print-xml.c
@@ -1,6 +1,6 @@
 /* Print an xml on generated parser, for Bison,
 
-   Copyright (C) 2007, 2009-2015, 2018-2020 Free Software Foundation,
+   Copyright (C) 2007, 2009-2015, 2018-2021 Free Software Foundation,
    Inc.
 
    This file is part of Bison, the GNU Compiler Compiler.
diff --git a/src/print-xml.h b/src/print-xml.h
index 9c6be7e2..76f9b6db 100644
--- a/src/print-xml.h
+++ b/src/print-xml.h
@@ -1,6 +1,6 @@
 /* Output an xml of the generated parser, for Bison.
 
-   Copyright (C) 2007, 2009-2015, 2018-2020 Free Software Foundation,
+   Copyright (C) 2007, 2009-2015, 2018-2021 Free Software Foundation,
    Inc.
 
    This file is part of Bison, the GNU Compiler Compiler.
diff --git a/src/print.c b/src/print.c
index 233d257a..7f1a593c 100644
--- a/src/print.c
+++ b/src/print.c
@@ -1,6 +1,6 @@
 /* Print information on generated parser, for bison,
 
-   Copyright (C) 1984, 1986, 1989, 2000-2005, 2007, 2009-2015, 2018-2020
+   Copyright (C) 1984, 1986, 1989, 2000-2005, 2007, 2009-2015, 2018-2021
    Free Software Foundation, Inc.
 
    This file is part of Bison, the GNU Compiler Compiler.
diff --git a/src/print.h b/src/print.h
index 027abce4..b3c52542 100644
--- a/src/print.h
+++ b/src/print.h
@@ -1,6 +1,6 @@
 /* Print information on generated parser, for bison,
 
-   Copyright (C) 2000, 2009-2015, 2018-2020 Free Software Foundation,
+   Copyright (C) 2000, 2009-2015, 2018-2021 Free Software Foundation,
    Inc.
 
    This file is part of Bison, the GNU Compiler Compiler.
diff --git a/src/reader.c b/src/reader.c
index e320865c..b1782b5f 100644
--- a/src/reader.c
+++ b/src/reader.c
@@ -1,7 +1,7 @@
 /* Input parser for Bison
 
    Copyright (C) 1984, 1986, 1989, 1992, 1998, 2000-2003, 2005-2007,
-   2009-2015, 2018-2020 Free Software Foundation, Inc.
+   2009-2015, 2018-2021 Free Software Foundation, Inc.
 
    This file is part of Bison, the GNU Compiler Compiler.
 
diff --git a/src/reader.h b/src/reader.h
index 7b08906b..04f40fd5 100644
--- a/src/reader.h
+++ b/src/reader.h
@@ -1,6 +1,6 @@
 /* Input parser for Bison
 
-   Copyright (C) 2000-2003, 2005-2007, 2009-2015, 2018-2020 Free
+   Copyright (C) 2000-2003, 2005-2007, 2009-2015, 2018-2021 Free
    Software Foundation, Inc.
 
    This file is part of Bison, the GNU Compiler Compiler.
diff --git a/src/reduce.c b/src/reduce.c
index c9979e0a..a6ad98e0 100644
--- a/src/reduce.c
+++ b/src/reduce.c
@@ -1,6 +1,6 @@
 /* Grammar reduction for Bison.
 
-   Copyright (C) 1988-1989, 2000-2003, 2005-2015, 2018-2020 Free
+   Copyright (C) 1988-1989, 2000-2003, 2005-2015, 2018-2021 Free
    Software Foundation, Inc.
 
    This file is part of Bison, the GNU Compiler Compiler.
diff --git a/src/reduce.h b/src/reduce.h
index 36110404..80b479c9 100644
--- a/src/reduce.h
+++ b/src/reduce.h
@@ -1,6 +1,6 @@
 /* Grammar reduction for Bison.
 
-   Copyright (C) 2000-2002, 2007, 2009-2015, 2018-2020 Free Software
+   Copyright (C) 2000-2002, 2007, 2009-2015, 2018-2021 Free Software
    Foundation, Inc.
 
    This file is part of Bison, the GNU Compiler Compiler.
diff --git a/src/relation.c b/src/relation.c
index e9c50086..23f1c1b7 100644
--- a/src/relation.c
+++ b/src/relation.c
@@ -1,6 +1,6 @@
 /* Binary relations.
 
-   Copyright (C) 2002, 2004-2005, 2009-2015, 2018-2020 Free Software
+   Copyright (C) 2002, 2004-2005, 2009-2015, 2018-2021 Free Software
    Foundation, Inc.
 
    This file is part of Bison, the GNU Compiler Compiler.
diff --git a/src/relation.h b/src/relation.h
index 14366393..55f7677d 100644
--- a/src/relation.h
+++ b/src/relation.h
@@ -1,6 +1,6 @@
 /* Binary relations.
 
-   Copyright (C) 2002, 2004, 2009-2015, 2018-2020 Free Software
+   Copyright (C) 2002, 2004, 2009-2015, 2018-2021 Free Software
    Foundation, Inc.
 
    This file is part of Bison, the GNU Compiler Compiler.
diff --git a/src/scan-code.h b/src/scan-code.h
index b564523d..afd99139 100644
--- a/src/scan-code.h
+++ b/src/scan-code.h
@@ -1,6 +1,6 @@
 /* Bison code properties structure and scanner.
 
-   Copyright (C) 2006-2007, 2009-2015, 2018-2020 Free Software
+   Copyright (C) 2006-2007, 2009-2015, 2018-2021 Free Software
    Foundation, Inc.
 
    This file is part of Bison, the GNU Compiler Compiler.
diff --git a/src/scan-code.l b/src/scan-code.l
index 23436a1f..03ec3bb8 100644
--- a/src/scan-code.l
+++ b/src/scan-code.l
@@ -1,6 +1,6 @@
 /* Bison Action Scanner                             -*- C -*-
 
-   Copyright (C) 2006-2015, 2018-2020 Free Software Foundation, Inc.
+   Copyright (C) 2006-2015, 2018-2021 Free Software Foundation, Inc.
 
    This file is part of Bison, the GNU Compiler Compiler.
 
diff --git a/src/scan-gram.h b/src/scan-gram.h
index 4483fa81..a6655ab2 100644
--- a/src/scan-gram.h
+++ b/src/scan-gram.h
@@ -1,6 +1,6 @@
 /* Bison Grammar Scanner
 
-   Copyright (C) 2006-2007, 2009-2015, 2018-2020 Free Software
+   Copyright (C) 2006-2007, 2009-2015, 2018-2021 Free Software
    Foundation, Inc.
 
    This file is part of Bison, the GNU Compiler Compiler.
diff --git a/src/scan-gram.l b/src/scan-gram.l
index c84d2b98..bcec247f 100644
--- a/src/scan-gram.l
+++ b/src/scan-gram.l
@@ -1,6 +1,6 @@
 /* Bison Grammar Scanner                             -*- C -*-
 
-   Copyright (C) 2002-2015, 2018-2020 Free Software Foundation, Inc.
+   Copyright (C) 2002-2015, 2018-2021 Free Software Foundation, Inc.
 
    This file is part of Bison, the GNU Compiler Compiler.
 
diff --git a/src/scan-skel.h b/src/scan-skel.h
index 5a6b5f3f..a138da29 100644
--- a/src/scan-skel.h
+++ b/src/scan-skel.h
@@ -1,6 +1,6 @@
 /* Scan Bison Skeletons.
 
-   Copyright (C) 2005-2007, 2009-2015, 2018-2020 Free Software
+   Copyright (C) 2005-2007, 2009-2015, 2018-2021 Free Software
    Foundation, Inc.
 
    This file is part of Bison, the GNU Compiler Compiler.
diff --git a/src/scan-skel.l b/src/scan-skel.l
index 4c524584..ce23d8c8 100644
--- a/src/scan-skel.l
+++ b/src/scan-skel.l
@@ -1,6 +1,6 @@
 /* Scan Bison Skeletons.                                       -*- C -*-
 
-   Copyright (C) 2001-2015, 2018-2020 Free Software Foundation, Inc.
+   Copyright (C) 2001-2015, 2018-2021 Free Software Foundation, Inc.
 
    This file is part of Bison, the GNU Compiler Compiler.
 
diff --git a/src/state-item.c b/src/state-item.c
index 4e496efc..2fa519ed 100644
--- a/src/state-item.c
+++ b/src/state-item.c
@@ -1,6 +1,6 @@
 /* Counterexample Generation Search Nodes
 
-   Copyright (C) 2020 Free Software Foundation, Inc.
+   Copyright (C) 2020-2021 Free Software Foundation, Inc.
 
    This file is part of Bison, the GNU Compiler Compiler.
 
diff --git a/src/state-item.h b/src/state-item.h
index bfe9f8be..387e6bfd 100644
--- a/src/state-item.h
+++ b/src/state-item.h
@@ -1,6 +1,6 @@
 /* Counterexample Generation Search Nodes
 
-   Copyright (C) 2020 Free Software Foundation, Inc.
+   Copyright (C) 2020-2021 Free Software Foundation, Inc.
 
    This file is part of Bison, the GNU Compiler Compiler.
 
diff --git a/src/state.c b/src/state.c
index 4a3d78aa..ed2520ad 100644
--- a/src/state.c
+++ b/src/state.c
@@ -1,6 +1,6 @@
 /* Type definitions for the finite state machine for Bison.
 
-   Copyright (C) 2001-2007, 2009-2015, 2018-2020 Free Software
+   Copyright (C) 2001-2007, 2009-2015, 2018-2021 Free Software
    Foundation, Inc.
 
    This file is part of Bison, the GNU Compiler Compiler.
diff --git a/src/state.h b/src/state.h
index 7024b3b5..84a171ae 100644
--- a/src/state.h
+++ b/src/state.h
@@ -1,6 +1,6 @@
 /* Type definitions for the finite state machine for Bison.
 
-   Copyright (C) 1984, 1989, 2000-2004, 2007, 2009-2015, 2018-2020 Free
+   Copyright (C) 1984, 1989, 2000-2004, 2007, 2009-2015, 2018-2021 Free
    Software Foundation, Inc.
 
    This file is part of Bison, the GNU Compiler Compiler.
diff --git a/src/strversion.c b/src/strversion.c
index 27c71d34..4b7d30bd 100644
--- a/src/strversion.c
+++ b/src/strversion.c
@@ -1,6 +1,6 @@
 /* Convert version string to int.
 
-   Copyright (C) 2020 Free Software Foundation, Inc.
+   Copyright (C) 2020-2021 Free Software Foundation, Inc.
 
    This file is part of Bison, the GNU Compiler Compiler.
 
diff --git a/src/strversion.h b/src/strversion.h
index 6d8d6235..1793552e 100644
--- a/src/strversion.h
+++ b/src/strversion.h
@@ -1,6 +1,6 @@
 /* Convert version string to int.
 
-   Copyright (C) 2020 Free Software Foundation, Inc.
+   Copyright (C) 2020-2021 Free Software Foundation, Inc.
 
    This file is part of Bison, the GNU Compiler Compiler.
 
diff --git a/src/symlist.c b/src/symlist.c
index 1e899646..0c7d3e35 100644
--- a/src/symlist.c
+++ b/src/symlist.c
@@ -1,6 +1,6 @@
 /* Lists of symbols for Bison
 
-   Copyright (C) 2002, 2005-2007, 2009-2015, 2018-2020 Free Software
+   Copyright (C) 2002, 2005-2007, 2009-2015, 2018-2021 Free Software
    Foundation, Inc.
 
    This file is part of Bison, the GNU Compiler Compiler.
diff --git a/src/symlist.h b/src/symlist.h
index 6a3a4d53..723aa8ad 100644
--- a/src/symlist.h
+++ b/src/symlist.h
@@ -1,6 +1,6 @@
 /* Lists of symbols for Bison
 
-   Copyright (C) 2002, 2005-2007, 2009-2015, 2018-2020 Free Software
+   Copyright (C) 2002, 2005-2007, 2009-2015, 2018-2021 Free Software
    Foundation, Inc.
 
    This file is part of Bison, the GNU Compiler Compiler.
diff --git a/src/symtab.c b/src/symtab.c
index d0ec50a9..82cfb409 100644
--- a/src/symtab.c
+++ b/src/symtab.c
@@ -1,6 +1,6 @@
 /* Symbol table manager for Bison.
 
-   Copyright (C) 1984, 1989, 2000-2002, 2004-2015, 2018-2020 Free
+   Copyright (C) 1984, 1989, 2000-2002, 2004-2015, 2018-2021 Free
    Software Foundation, Inc.
 
    This file is part of Bison, the GNU Compiler Compiler.
diff --git a/src/symtab.h b/src/symtab.h
index 1ec8042b..a259fb16 100644
--- a/src/symtab.h
+++ b/src/symtab.h
@@ -1,6 +1,6 @@
 /* Definitions for symtab.c and callers, part of Bison.
 
-   Copyright (C) 1984, 1989, 1992, 2000-2002, 2004-2015, 2018-2020 Free
+   Copyright (C) 1984, 1989, 1992, 2000-2002, 2004-2015, 2018-2021 Free
    Software Foundation, Inc.
 
    This file is part of Bison, the GNU Compiler Compiler.
diff --git a/src/system.h b/src/system.h
index fb65d573..4ebb51ad 100644
--- a/src/system.h
+++ b/src/system.h
@@ -1,6 +1,6 @@
 /* System-dependent definitions for Bison.
 
-   Copyright (C) 2000-2007, 2009-2015, 2018-2020 Free Software
+   Copyright (C) 2000-2007, 2009-2015, 2018-2021 Free Software
    Foundation, Inc.
 
    This program is free software: you can redistribute it and/or modify
diff --git a/src/tables.c b/src/tables.c
index d26a4a97..0c98c327 100644
--- a/src/tables.c
+++ b/src/tables.c
@@ -1,6 +1,6 @@
 /* Output the generated parsing program for Bison.
 
-   Copyright (C) 1984, 1986, 1989, 1992, 2000-2006, 2009-2015, 2018-2020
+   Copyright (C) 1984, 1986, 1989, 1992, 2000-2006, 2009-2015, 2018-2021
    Free Software Foundation, Inc.
 
    This file is part of Bison, the GNU Compiler Compiler.
diff --git a/src/tables.h b/src/tables.h
index b0d420ad..7ba213b5 100644
--- a/src/tables.h
+++ b/src/tables.h
@@ -1,6 +1,6 @@
 /* Prepare the LALR and GLR parser tables.
 
-   Copyright (C) 2002, 2004, 2009-2015, 2018-2020 Free Software
+   Copyright (C) 2002, 2004, 2009-2015, 2018-2021 Free Software
    Foundation, Inc.
 
    This file is part of Bison, the GNU Compiler Compiler.
diff --git a/src/uniqstr.c b/src/uniqstr.c
index a2b66cc6..462d0318 100644
--- a/src/uniqstr.c
+++ b/src/uniqstr.c
@@ -1,6 +1,6 @@
 /* Keep a unique copy of strings.
 
-   Copyright (C) 2002-2005, 2009-2015, 2018-2020 Free Software
+   Copyright (C) 2002-2005, 2009-2015, 2018-2021 Free Software
    Foundation, Inc.
 
    This file is part of Bison, the GNU Compiler Compiler.
diff --git a/src/uniqstr.h b/src/uniqstr.h
index 8f61ef4b..f9950ded 100644
--- a/src/uniqstr.h
+++ b/src/uniqstr.h
@@ -1,6 +1,6 @@
 /* Keeping a unique copy of strings.
 
-   Copyright (C) 2002-2003, 2008-2015, 2018-2020 Free Software
+   Copyright (C) 2002-2003, 2008-2015, 2018-2021 Free Software
    Foundation, Inc.
 
    This file is part of Bison, the GNU Compiler Compiler.
diff --git a/tests/actions.at b/tests/actions.at
index 2c4f80ee..33f1043f 100644
--- a/tests/actions.at
+++ b/tests/actions.at
@@ -1,6 +1,6 @@
 # Executing Actions.                               -*- Autotest -*-
 
-# Copyright (C) 2001-2015, 2018-2020 Free Software Foundation, Inc.
+# Copyright (C) 2001-2015, 2018-2021 Free Software Foundation, Inc.
 
 # This program is free software: you can redistribute it and/or modify
 # it under the terms of the GNU General Public License as published by
diff --git a/tests/atlocal.in b/tests/atlocal.in
index 23eb9ae2..2642de9f 100644
--- a/tests/atlocal.in
+++ b/tests/atlocal.in
@@ -1,7 +1,7 @@
 # @configure_input@                                     -*- shell-script -*-
 # Configurable variable values for Bison test suite.
 
-# Copyright (C) 2000-2015, 2018-2020 Free Software Foundation, Inc.
+# Copyright (C) 2000-2015, 2018-2021 Free Software Foundation, Inc.
 #
 # This program is free software: you can redistribute it and/or modify
 # it under the terms of the GNU General Public License as published by
diff --git a/tests/bison.in b/tests/bison.in
index f3b05b5b..e9f761e3 100644
--- a/tests/bison.in
+++ b/tests/bison.in
@@ -2,7 +2,7 @@
 # @configure_input@
 # Wrapper around a non installed bison to make it work as an installed one.
 
-# Copyright (C) 2001-2015, 2018-2020 Free Software Foundation, Inc.
+# Copyright (C) 2001-2015, 2018-2021 Free Software Foundation, Inc.
 #
 # This program is free software: you can redistribute it and/or modify
 # it under the terms of the GNU General Public License as published by
diff --git a/tests/c++.at b/tests/c++.at
index 018a1f68..bf195549 100644
--- a/tests/c++.at
+++ b/tests/c++.at
@@ -1,6 +1,6 @@
 # Checking the C++ Features.                    -*- Autotest -*-
 
-# Copyright (C) 2004-2005, 2007-2015, 2018-2020 Free Software
+# Copyright (C) 2004-2005, 2007-2015, 2018-2021 Free Software
 # Foundation, Inc.
 
 # This program is free software: you can redistribute it and/or modify
diff --git a/tests/calc.at b/tests/calc.at
index e7a5b070..1d2e818d 100644
--- a/tests/calc.at
+++ b/tests/calc.at
@@ -1,6 +1,6 @@
 # Simple calculator.                         -*- Autotest -*-
 
-# Copyright (C) 2000-2015, 2018-2020 Free Software Foundation, Inc.
+# Copyright (C) 2000-2015, 2018-2021 Free Software Foundation, Inc.
 
 # This program is free software: you can redistribute it and/or modify
 # it under the terms of the GNU General Public License as published by
diff --git a/tests/conflicts.at b/tests/conflicts.at
index de48ec0f..1c2cad42 100644
--- a/tests/conflicts.at
+++ b/tests/conflicts.at
@@ -1,6 +1,6 @@
 # Exercising Bison on conflicts.                         -*- Autotest -*-
 
-# Copyright (C) 2002-2005, 2007-2015, 2018-2020 Free Software
+# Copyright (C) 2002-2005, 2007-2015, 2018-2021 Free Software
 # Foundation, Inc.
 
 # This program is free software: you can redistribute it and/or modify
diff --git a/tests/counterexample.at b/tests/counterexample.at
index fcc239bb..2b1c1db7 100644
--- a/tests/counterexample.at
+++ b/tests/counterexample.at
@@ -1,6 +1,6 @@
 # Exercising Bison on counterexamples.                         -*- Autotest -*-
 
-# Copyright (C) 2020 Free Software Foundation, Inc.
+# Copyright (C) 2020-2021 Free Software Foundation, Inc.
 
 # This program is free software: you can redistribute it and/or modify
 # it under the terms of the GNU General Public License as published by
diff --git a/tests/cxx-type.at b/tests/cxx-type.at
index 3181e47a..61d93c4d 100644
--- a/tests/cxx-type.at
+++ b/tests/cxx-type.at
@@ -1,6 +1,6 @@
 # Checking GLR Parsing.                         -*- Autotest -*-
 
-# Copyright (C) 2002-2015, 2018-2020 Free Software Foundation, Inc.
+# Copyright (C) 2002-2015, 2018-2021 Free Software Foundation, Inc.
 
 # This program is free software: you can redistribute it and/or modify
 # it under the terms of the GNU General Public License as published by
diff --git a/tests/d.at b/tests/d.at
index 869824fe..0b51b0a0 100644
--- a/tests/d.at
+++ b/tests/d.at
@@ -1,6 +1,6 @@
 # D features tests.                      -*- Autotest -*-
 
-# Copyright (C) 2020 Free Software Foundation, Inc.
+# Copyright (C) 2020-2021 Free Software Foundation, Inc.
 
 # This program is free software: you can redistribute it and/or modify
 # it under the terms of the GNU General Public License as published by
diff --git a/tests/diagnostics.at b/tests/diagnostics.at
index 109eaa97..090512a3 100644
--- a/tests/diagnostics.at
+++ b/tests/diagnostics.at
@@ -1,6 +1,6 @@
 # Checking diagnostics.                              -*- Autotest -*-
 
-# Copyright (C) 2019-2020 Free Software Foundation, Inc.
+# Copyright (C) 2019-2021 Free Software Foundation, Inc.
 
 # This program is free software: you can redistribute it and/or modify
 # it under the terms of the GNU General Public License as published by
diff --git a/tests/existing.at b/tests/existing.at
index 4700f9a8..d306c33d 100644
--- a/tests/existing.at
+++ b/tests/existing.at
@@ -1,6 +1,6 @@
 # Exercising Bison on actual grammars.                   -*- Autotest -*-
 
-# Copyright (C) 1989-1992, 2000-2005, 2007, 2009-2015, 2018-2020 Free
+# Copyright (C) 1989-1992, 2000-2005, 2007, 2009-2015, 2018-2021 Free
 # Software Foundation, Inc.
 
 # This program is free software: you can redistribute it and/or modify
diff --git a/tests/glr-regression.at b/tests/glr-regression.at
index e31ebf4f..ad0454f0 100644
--- a/tests/glr-regression.at
+++ b/tests/glr-regression.at
@@ -1,6 +1,6 @@
 # Checking GLR Parsing: Regression Tests           -*- Autotest -*-
 
-# Copyright (C) 2002-2003, 2005-2007, 2009-2015, 2018-2020 Free Software
+# Copyright (C) 2002-2003, 2005-2007, 2009-2015, 2018-2021 Free Software
 # Foundation, Inc.
 
 # This program is free software: you can redistribute it and/or modify
diff --git a/tests/headers.at b/tests/headers.at
index c77a42c8..40f2d088 100644
--- a/tests/headers.at
+++ b/tests/headers.at
@@ -1,6 +1,6 @@
 # Bison Parser Headers.                               -*- Autotest -*-
 
-# Copyright (C) 2001-2002, 2006-2007, 2009-2015, 2018-2020 Free Software
+# Copyright (C) 2001-2002, 2006-2007, 2009-2015, 2018-2021 Free Software
 # Foundation, Inc.
 
 # This program is free software: you can redistribute it and/or modify
diff --git a/tests/input.at b/tests/input.at
index 26f52cf7..11ccac34 100644
--- a/tests/input.at
+++ b/tests/input.at
@@ -1,6 +1,6 @@
 # Checking the Bison reader.                    -*- Autotest -*-
 
-# Copyright (C) 2002-2015, 2018-2020 Free Software Foundation, Inc.
+# Copyright (C) 2002-2015, 2018-2021 Free Software Foundation, Inc.
 
 # This program is free software: you can redistribute it and/or modify
 # it under the terms of the GNU General Public License as published by
diff --git a/tests/java.at b/tests/java.at
index 1d80ae63..ba37e9c2 100644
--- a/tests/java.at
+++ b/tests/java.at
@@ -1,6 +1,6 @@
 # Java tests for simple calculator.           -*- Autotest -*-
 
-# Copyright (C) 2007-2015, 2018-2020 Free Software Foundation, Inc.
+# Copyright (C) 2007-2015, 2018-2021 Free Software Foundation, Inc.
 
 # This program is free software: you can redistribute it and/or modify
 # it under the terms of the GNU General Public License as published by
diff --git a/tests/javapush.at b/tests/javapush.at
index b3027c65..db49fbdc 100644
--- a/tests/javapush.at
+++ b/tests/javapush.at
@@ -1,6 +1,6 @@
 # Checking Java Push Parsing.                            -*- Autotest -*-
 
-# Copyright (C) 2013-2015, 2018-2020 Free Software Foundation, Inc.
+# Copyright (C) 2013-2015, 2018-2021 Free Software Foundation, Inc.
 
 # This program is free software: you can redistribute it and/or modify
 # it under the terms of the GNU General Public License as published by
diff --git a/tests/linear b/tests/linear
index b12c972d..18a4f90a 100755
--- a/tests/linear
+++ b/tests/linear
@@ -3,7 +3,7 @@
 # Build a grammar whose LALR(1) parser has a given number of states.
 # Useful to test edge cases (e.g., 256 and 257 states, etc.).
 
-# Copyright (C) 2020 Free Software Foundation, Inc.
+# Copyright (C) 2020-2021 Free Software Foundation, Inc.
 #
 # This program is free software: you can redistribute it and/or modify
 # it under the terms of the GNU General Public License as published by
diff --git a/tests/local.at b/tests/local.at
index 6390e562..e0885541 100644
--- a/tests/local.at
+++ b/tests/local.at
@@ -2,7 +2,7 @@
 
 # Macros for the GNU Bison Test suite.
 
-# Copyright (C) 2003-2015, 2018-2020 Free Software Foundation, Inc.
+# Copyright (C) 2003-2015, 2018-2021 Free Software Foundation, Inc.
 
 # This program is free software: you can redistribute it and/or modify
 # it under the terms of the GNU General Public License as published by
diff --git a/tests/local.mk b/tests/local.mk
index df3bbcad..37c542ad 100644
--- a/tests/local.mk
+++ b/tests/local.mk
@@ -1,6 +1,6 @@
 ## Makefile for Bison testsuite.
 
-## Copyright (C) 2000-2015, 2018-2020 Free Software Foundation, Inc.
+## Copyright (C) 2000-2015, 2018-2021 Free Software Foundation, Inc.
 ##
 ## This program is free software: you can redistribute it and/or modify
 ## it under the terms of the GNU General Public License as published by
diff --git a/tests/m4.at b/tests/m4.at
index 6a2ff83f..d6cb176d 100644
--- a/tests/m4.at
+++ b/tests/m4.at
@@ -1,6 +1,6 @@
 # Basic m4 macros.                               -*- Autotest -*-
 
-# Copyright (C) 2020 Free Software Foundation, Inc.
+# Copyright (C) 2020-2021 Free Software Foundation, Inc.
 
 # This program is free software: you can redistribute it and/or modify
 # it under the terms of the GNU General Public License as published by
diff --git a/tests/named-refs.at b/tests/named-refs.at
index fb901ee5..111436c1 100644
--- a/tests/named-refs.at
+++ b/tests/named-refs.at
@@ -1,6 +1,6 @@
 # Named references test.                           -*- Autotest -*-
 
-# Copyright (C) 2009-2015, 2018-2020 Free Software Foundation, Inc.
+# Copyright (C) 2009-2015, 2018-2021 Free Software Foundation, Inc.
 
 # This program is free software: you can redistribute it and/or modify
 # it under the terms of the GNU General Public License as published by
diff --git a/tests/output.at b/tests/output.at
index a69fbdff..9ec20cd2 100644
--- a/tests/output.at
+++ b/tests/output.at
@@ -1,6 +1,6 @@
 # Checking the output filenames.                    -*- Autotest -*-
 
-# Copyright (C) 2000-2002, 2005-2015, 2018-2020 Free Software
+# Copyright (C) 2000-2002, 2005-2015, 2018-2021 Free Software
 # Foundation, Inc.
 
 # This program is free software: you can redistribute it and/or modify
diff --git a/tests/push.at b/tests/push.at
index 16303777..960a4e3b 100644
--- a/tests/push.at
+++ b/tests/push.at
@@ -1,6 +1,6 @@
 # Checking Push Parsing.                            -*- Autotest -*-
 
-# Copyright (C) 2007, 2009-2015, 2018-2020 Free Software Foundation,
+# Copyright (C) 2007, 2009-2015, 2018-2021 Free Software Foundation,
 # Inc.
 
 # This program is free software: you can redistribute it and/or modify
diff --git a/tests/reduce.at b/tests/reduce.at
index daaf3378..6c3fce08 100644
--- a/tests/reduce.at
+++ b/tests/reduce.at
@@ -1,6 +1,6 @@
 # Exercising Bison Grammar Reduction.                      -*- Autotest -*-
 
-# Copyright (C) 2001-2002, 2007-2015, 2018-2020 Free Software
+# Copyright (C) 2001-2002, 2007-2015, 2018-2021 Free Software
 # Foundation, Inc.
 
 # This program is free software: you can redistribute it and/or modify
diff --git a/tests/regression.at b/tests/regression.at
index 5bb05ae9..0d2c3b17 100644
--- a/tests/regression.at
+++ b/tests/regression.at
@@ -1,6 +1,6 @@
 # Bison Regressions.                               -*- Autotest -*-
 
-# Copyright (C) 2001-2015, 2018-2020 Free Software Foundation, Inc.
+# Copyright (C) 2001-2015, 2018-2021 Free Software Foundation, Inc.
 
 # This program is free software: you can redistribute it and/or modify
 # it under the terms of the GNU General Public License as published by
diff --git a/tests/report.at b/tests/report.at
index c6190491..0a9840df 100644
--- a/tests/report.at
+++ b/tests/report.at
@@ -1,6 +1,6 @@
 # Bison Reports.                               -*- Autotest -*-
 
-# Copyright (C) 2018-2020 Free Software Foundation, Inc.
+# Copyright (C) 2018-2021 Free Software Foundation, Inc.
 
 # This program is free software: you can redistribute it and/or modify
 # it under the terms of the GNU General Public License as published by
diff --git a/tests/scanner.at b/tests/scanner.at
index 023e2791..92f5a380 100644
--- a/tests/scanner.at
+++ b/tests/scanner.at
@@ -1,6 +1,6 @@
 # Interface with the scanner.                           -*- Autotest -*-
 
-# Copyright (C) 2019-2020 Free Software Foundation, Inc.
+# Copyright (C) 2019-2021 Free Software Foundation, Inc.
 
 # This program is free software: you can redistribute it and/or modify
 # it under the terms of the GNU General Public License as published by
diff --git a/tests/sets.at b/tests/sets.at
index 4b06c111..05bad22a 100644
--- a/tests/sets.at
+++ b/tests/sets.at
@@ -1,6 +1,6 @@
 # Exercising Bison Grammar Sets.                      -*- Autotest -*-
 
-# Copyright (C) 2001-2002, 2005, 2007, 2009-2015, 2018-2020 Free
+# Copyright (C) 2001-2002, 2005, 2007, 2009-2015, 2018-2021 Free
 # Software Foundation, Inc.
 
 # This program is free software: you can redistribute it and/or modify
diff --git a/tests/skeletons.at b/tests/skeletons.at
index 744e57b5..da81cf5d 100644
--- a/tests/skeletons.at
+++ b/tests/skeletons.at
@@ -1,6 +1,6 @@
 # Checking skeleton support.                     -*- Autotest -*-
 
-# Copyright (C) 2007, 2009-2015, 2018-2020 Free Software Foundation,
+# Copyright (C) 2007, 2009-2015, 2018-2021 Free Software Foundation,
 # Inc.
 
 # This program is free software: you can redistribute it and/or modify
diff --git a/tests/synclines.at b/tests/synclines.at
index 7a4de5db..02651892 100644
--- a/tests/synclines.at
+++ b/tests/synclines.at
@@ -1,6 +1,6 @@
 # Executing Actions.                               -*- Autotest -*-
 
-# Copyright (C) 2002, 2004-2005, 2007, 2009-2015, 2018-2020 Free
+# Copyright (C) 2002, 2004-2005, 2007, 2009-2015, 2018-2021 Free
 # Software Foundation, Inc.
 
 # This program is free software: you can redistribute it and/or modify
diff --git a/tests/testsuite.at b/tests/testsuite.at
index 5741b811..a1d7c81d 100644
--- a/tests/testsuite.at
+++ b/tests/testsuite.at
@@ -1,6 +1,6 @@
 # Test suite for GNU Bison.                             -*- Autotest -*-
 
-# Copyright (C) 2000-2004, 2006-2007, 2009-2015, 2018-2020 Free Software
+# Copyright (C) 2000-2004, 2006-2007, 2009-2015, 2018-2021 Free Software
 # Foundation, Inc.
 
 # This program is free software: you can redistribute it and/or modify
diff --git a/tests/torture.at b/tests/torture.at
index f41b8487..47fbc539 100644
--- a/tests/torture.at
+++ b/tests/torture.at
@@ -1,6 +1,6 @@
 # Torturing Bison.                                    -*- Autotest -*-
 
-# Copyright (C) 2001-2002, 2004-2007, 2009-2015, 2018-2020 Free Software
+# Copyright (C) 2001-2002, 2004-2007, 2009-2015, 2018-2021 Free Software
 # Foundation, Inc.
 
 # This program is free software: you can redistribute it and/or modify
diff --git a/tests/types.at b/tests/types.at
index e35b0d40..6dd3e68a 100644
--- a/tests/types.at
+++ b/tests/types.at
@@ -1,6 +1,6 @@
 # Value type.                                     -*- Autotest -*-
 
-# Copyright (C) 2013-2015, 2018-2020 Free Software Foundation, Inc.
+# Copyright (C) 2013-2015, 2018-2021 Free Software Foundation, Inc.
 
 # This program is free software: you can redistribute it and/or modify
 # it under the terms of the GNU General Public License as published by