diff --git a/bison.simple b/bison.simple
index 9290704c..0fb74ce7 100644
--- a/bison.simple
+++ b/bison.simple
@@ -21,7 +21,7 @@
 /* As a special exception, when this file is copied by Bison into a
    Bison output file, you may use that output file without restriction.
    This special exception was added by the Free Software Foundation
-   in version 1.23 of Bison.  */
+   in version 1.24 of Bison.  */
 
 #ifndef alloca
 #ifdef __GNUC__
diff --git a/src/bison.s1 b/src/bison.s1
index 9290704c..0fb74ce7 100644
--- a/src/bison.s1
+++ b/src/bison.s1
@@ -21,7 +21,7 @@
 /* As a special exception, when this file is copied by Bison into a
    Bison output file, you may use that output file without restriction.
    This special exception was added by the Free Software Foundation
-   in version 1.23 of Bison.  */
+   in version 1.24 of Bison.  */
 
 #ifndef alloca
 #ifdef __GNUC__
diff --git a/src/bison.simple b/src/bison.simple
index 9290704c..0fb74ce7 100644
--- a/src/bison.simple
+++ b/src/bison.simple
@@ -21,7 +21,7 @@
 /* As a special exception, when this file is copied by Bison into a
    Bison output file, you may use that output file without restriction.
    This special exception was added by the Free Software Foundation
-   in version 1.23 of Bison.  */
+   in version 1.24 of Bison.  */
 
 #ifndef alloca
 #ifdef __GNUC__