diff --git a/.prev-version b/.prev-version
index 65665b48..85e0a216 100644
--- a/.prev-version
+++ b/.prev-version
@@ -1 +1 @@
-3.5.90
+3.5.91
diff --git a/NEWS b/NEWS
index 4b439c66..07be8d75 100644
--- a/NEWS
+++ b/NEWS
@@ -1,5 +1,8 @@
 GNU Bison NEWS
 
+* Noteworthy changes in release ?.? (????-??-??) [?]
+
+
 * Noteworthy changes in release 3.5.91 (2020-04-29) [stable]
 
 ** New features