diff --git a/autogen.sh b/autogen.sh
index 0f3d8092..1401374d 100755
--- a/autogen.sh
+++ b/autogen.sh
@@ -4,7 +4,7 @@
 # also regenerates all aclocal.m4, config.h.in, Makefile.in, configure files
 # with new versions of autoconf or automake.
 
-# Copyright (C) 2003-2025 Free Software Foundation, Inc.
+# Copyright (C) 2003-2026 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/autopull.sh b/autopull.sh
index 04f60634..a5c1b910 100755
--- a/autopull.sh
+++ b/autopull.sh
@@ -2,7 +2,7 @@
 # Convenience script for fetching auxiliary files that are omitted from
 # the version control repository of this package.
 
-# Copyright (C) 2003-2025 Free Software Foundation, Inc.
+# Copyright (C) 2003-2026 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/bootstrap b/bootstrap
index 6542faaf..3dac6440 100755
--- a/bootstrap
+++ b/bootstrap
@@ -3,7 +3,7 @@
 
 scriptversion=2025-06-10.02; # UTC
 
-# Copyright (C) 2003-2025 Free Software Foundation, Inc.
+# Copyright (C) 2003-2026 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/bootstrap-funclib.sh b/bootstrap-funclib.sh
index 0ed5be46..8a0116a7 100644
--- a/bootstrap-funclib.sh
+++ b/bootstrap-funclib.sh
@@ -1,8 +1,8 @@
 # A library of shell functions for autopull.sh, autogen.sh, and bootstrap.
 
-scriptlibversion=2025-09-07.23; # UTC
+scriptlibversion=2025-12-04.19; # UTC
 
-# Copyright (C) 2003-2025 Free Software Foundation, Inc.
+# Copyright (C) 2003-2026 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
@@ -824,7 +824,8 @@ autopull()
     elif check_exists git-merge-changelog; then
       echo "$0: initializing git-merge-changelog driver"
       git config merge.merge-changelog.name 'GNU-style ChangeLog merge driver'
-      git config merge.merge-changelog.driver 'git-merge-changelog %O %A %B'
+      git config merge.merge-changelog.driver \
+          'git-merge-changelog %O %A %B "%Y"'
     else
       echo "$0: consider installing git-merge-changelog from gnulib"
     fi
diff --git a/gnulib b/gnulib
index dba11055..8e8991c4 160000
--- a/gnulib
+++ b/gnulib
@@ -1 +1 @@
-Subproject commit dba110550c98af5a7843714e49ee36a7ebb206f1
+Subproject commit 8e8991c4115ae0274d481144ae6e6c0754642fb4