; Add 2026 to copyright years.

56 files changed, 63 insertions, 67 deletions

diff --git a/admin/ChangeLog.1 b/admin/ChangeLog.1
index beb5974c1fc..166798122c5 100644
--- a/admin/ChangeLog.1
+++ b/admin/ChangeLog.1
@@ -2577,7 +2577,7 @@
 ;; coding: utf-8
 ;; End:
 
-  Copyright (C) 2001-2025 Free Software Foundation, Inc.
+  Copyright (C) 2001-2026 Free Software Foundation, Inc.
 
   This file is part of GNU Emacs.
 
diff --git a/admin/README b/admin/README
index 73ea015118c..3e86319f2a3 100644
--- a/admin/README
+++ b/admin/README
@@ -1,4 +1,4 @@
-Copyright (C) 2001-2025 Free Software Foundation, Inc.
+Copyright (C) 2001-2026 Free Software Foundation, Inc.
 See the end of the file for license conditions.
 
 
diff --git a/admin/admin.el b/admin/admin.el
index 7e761c3f1f4..d4639ce4bc9 100644
--- a/admin/admin.el
+++ b/admin/admin.el
@@ -1,6 +1,6 @@
 ;;; admin.el --- utilities for Emacs administration  -*- lexical-binding: t; -*-
 
-;; Copyright (C) 2001-2025 Free Software Foundation, Inc.
+;; Copyright (C) 2001-2026 Free Software Foundation, Inc.
 
 ;; This file is part of GNU Emacs.
 
diff --git a/admin/alloc-colors.c b/admin/alloc-colors.c
index dbbb5ce6dbe..bcbc899cf3d 100644
--- a/admin/alloc-colors.c
+++ b/admin/alloc-colors.c
@@ -1,6 +1,6 @@
 /* Allocate X colors.  Used for testing with dense colormaps.
 
-Copyright (C) 2001-2025 Free Software Foundation, Inc.
+Copyright (C) 2001-2026 Free Software Foundation, Inc.
 
 This file is part of GNU Emacs.
 
diff --git a/admin/authors.el b/admin/authors.el
index 27df4ce97c0..afcc56c6003 100644
--- a/admin/authors.el
+++ b/admin/authors.el
@@ -1,6 +1,6 @@
 ;;; authors.el --- utility for maintaining Emacs's AUTHORS file  -*- lexical-binding: t; -*-
 
-;; Copyright (C) 2000-2025 Free Software Foundation, Inc.
+;; Copyright (C) 2000-2026 Free Software Foundation, Inc.
 
 ;; Author: Gerd Moellmann <gerd@gnu.org>
 ;; Maintainer: emacs-devel@gnu.org
diff --git a/admin/automerge b/admin/automerge
index b6bc4d51764..c3b7a5ae836 100755
--- a/admin/automerge
+++ b/admin/automerge
@@ -1,7 +1,7 @@
 #!/bin/bash
 ### automerge - automatically merge the Emacs release branch to master
 
-## Copyright (C) 2018-2025 Free Software Foundation, Inc.
+## Copyright (C) 2018-2026 Free Software Foundation, Inc.
 
 ## Author: Glenn Morris <rgm@gnu.org>
 ## Maintainer: Stefan Kangas <stefankangas@gmail.com>
diff --git a/admin/build-configs b/admin/build-configs
index c8810882d15..10a6bd09216 100755
--- a/admin/build-configs
+++ b/admin/build-configs
@@ -1,7 +1,7 @@
 #! /usr/bin/perl
 # Build Emacs in several different configurations.
 
-# Copyright (C) 2001-2025 Free Software Foundation, Inc.
+# Copyright (C) 2001-2026 Free Software Foundation, Inc.
 
 # This file is part of GNU Emacs.
 
diff --git a/admin/charsets/Makefile.in b/admin/charsets/Makefile.in
index 3553f95336d..af2f52f41c3 100644
--- a/admin/charsets/Makefile.in
+++ b/admin/charsets/Makefile.in
@@ -1,6 +1,6 @@
 ### @configure_input@
 
-# Copyright (C) 2015-2025 Free Software Foundation, Inc.
+# Copyright (C) 2015-2026 Free Software Foundation, Inc.
 
 # Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011
 #   National Institute of Advanced Industrial Science and Technology (AIST)
diff --git a/admin/charsets/mapconv b/admin/charsets/mapconv
index 8505fe3f9b2..24bf118db93 100755
--- a/admin/charsets/mapconv
+++ b/admin/charsets/mapconv
@@ -1,6 +1,6 @@
 #!/bin/sh
 
-# Copyright (C) 2015-2025 Free Software Foundation, Inc.
+# Copyright (C) 2015-2026 Free Software Foundation, Inc.
 
 # Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011
 #   National Institute of Advanced Industrial Science and Technology (AIST)
diff --git a/admin/charsets/mapfiles/README b/admin/charsets/mapfiles/README
index 73e24d97512..fd3579f17fa 100644
--- a/admin/charsets/mapfiles/README
+++ b/admin/charsets/mapfiles/README
@@ -1,4 +1,4 @@
-Copyright (C) 2009-2025 Free Software Foundation, Inc.
+Copyright (C) 2009-2026 Free Software Foundation, Inc.
 Copyright (C) 2009, 2010, 2011
   National Institute of Advanced Industrial Science and Technology (AIST)
   Registration Number H13PRO009
diff --git a/admin/check-man-pages b/admin/check-man-pages
index 84ca56bf084..497583759ee 100755
--- a/admin/check-man-pages
+++ b/admin/check-man-pages
@@ -1,7 +1,7 @@
 #!/bin/bash
 ### check-man-pages - check man pages for errors
 
-## Copyright (C) 2022-2025 Free Software Foundation, Inc.
+## Copyright (C) 2022-2026 Free Software Foundation, Inc.
 
 ## Author: Stefan Kangas <stefankangas@gmail.com>
 
diff --git a/admin/cus-test.el b/admin/cus-test.el
index 9740ce27111..3eaf63cc286 100644
--- a/admin/cus-test.el
+++ b/admin/cus-test.el
@@ -1,6 +1,6 @@
 ;;; cus-test.el --- tests for custom types and load problems  -*- lexical-binding: t; -*-
 
-;; Copyright (C) 1998, 2000, 2002-2025 Free Software Foundation, Inc.
+;; Copyright (C) 1998, 2000, 2002-2026 Free Software Foundation, Inc.
 
 ;; Author: Markus Rost <rost@math.uni-bielefeld.de>
 ;; Created: 13 Sep 1998
diff --git a/admin/diff-tar-files b/admin/diff-tar-files
index 8f3bae51983..f49fbf50e6a 100755
--- a/admin/diff-tar-files
+++ b/admin/diff-tar-files
@@ -1,6 +1,6 @@
 #!/bin/bash
 
-# Copyright (C) 2001-2025 Free Software Foundation, Inc.
+# Copyright (C) 2001-2026 Free Software Foundation, Inc.
 
 # This file is part of GNU Emacs.
 
diff --git a/admin/emacs-shell-lib b/admin/emacs-shell-lib
index 842474ec959..080ce560f33 100644
--- a/admin/emacs-shell-lib
+++ b/admin/emacs-shell-lib
@@ -1,7 +1,7 @@
 #!/bin/bash
 ### emacs-shell-lib - shared code for Emacs shell scripts
 
-## Copyright (C) 2022-2025 Free Software Foundation, Inc.
+## Copyright (C) 2022-2026 Free Software Foundation, Inc.
 
 ## Author: Stefan Kangas <stefankangas@gmail.com>
 
diff --git a/admin/emake b/admin/emake
index dbb0bb356fb..0dd283a61c0 100755
--- a/admin/emake
+++ b/admin/emake
@@ -1,6 +1,6 @@
 #!/bin/bash
 
-# Copyright (C) 2022-2025 Free Software Foundation, Inc.
+# Copyright (C) 2022-2026 Free Software Foundation, Inc.
 
 # This file is part of GNU Emacs.
 
diff --git a/admin/find-gc.el b/admin/find-gc.el
index d68a1e6c0bf..1ea0dd6f1bf 100644
--- a/admin/find-gc.el
+++ b/admin/find-gc.el
@@ -1,6 +1,6 @@
 ;;; find-gc.el --- detect functions that call the garbage collector  -*- lexical-binding: t; -*-
 
-;; Copyright (C) 1992, 2001-2025 Free Software Foundation, Inc.
+;; Copyright (C) 1992, 2001-2026 Free Software Foundation, Inc.
 
 ;; Maintainer: emacs-devel@gnu.org
 
diff --git a/admin/git-bisect-start b/admin/git-bisect-start
index 7d8ed448614..184a808caa7 100755
--- a/admin/git-bisect-start
+++ b/admin/git-bisect-start
@@ -6,7 +6,7 @@
 ### default options, on a GNU/Linux computer and with GCC; see below),
 ### are skipped.
 
-## Copyright (C) 2022-2025 Free Software Foundation, Inc.
+## Copyright (C) 2022-2026 Free Software Foundation, Inc.
 
 ## This file is part of GNU Emacs.
 
diff --git a/admin/gitmerge.el b/admin/gitmerge.el
index 5bfb23dc3a2..a2aae07db7f 100644
--- a/admin/gitmerge.el
+++ b/admin/gitmerge.el
@@ -1,6 +1,6 @@
 ;;; gitmerge.el --- help merge one Emacs branch into another  -*- lexical-binding: t; -*-
 
-;; Copyright (C) 2010-2025 Free Software Foundation, Inc.
+;; Copyright (C) 2010-2026 Free Software Foundation, Inc.
 
 ;; Authors: David Engster <deng@randomsample.de>
 ;;          Stefan Monnier <monnier@iro.umontreal.ca>
diff --git a/admin/grammars/Makefile.in b/admin/grammars/Makefile.in
index 8436d7fb3c1..78d4c158091 100644
--- a/admin/grammars/Makefile.in
+++ b/admin/grammars/Makefile.in
@@ -1,6 +1,6 @@
 ### @configure_input@
 
-## Copyright (C) 2013-2025 Free Software Foundation, Inc.
+## Copyright (C) 2013-2026 Free Software Foundation, Inc.
 
 ## This file is part of GNU Emacs.
 
diff --git a/admin/grammars/c.by b/admin/grammars/c.by
index f193cc7775a..a5fc1ecb61d 100644
--- a/admin/grammars/c.by
+++ b/admin/grammars/c.by
@@ -1,5 +1,5 @@
 ;;; c.by -- LL grammar for C/C++ language specification
-;; Copyright (C) 1999-2025 Free Software Foundation, Inc.
+;; Copyright (C) 1999-2026 Free Software Foundation, Inc.
 ;;
 ;; Author: Eric M. Ludlam <zappo@gnu.org>
 ;;         David Ponce <david@dponce.com>
diff --git a/admin/grammars/grammar.wy b/admin/grammars/grammar.wy
index beb21382824..5256ec31984 100644
--- a/admin/grammars/grammar.wy
+++ b/admin/grammars/grammar.wy
@@ -1,6 +1,6 @@
 ;;; semantic-grammar.wy -- LALR grammar of Semantic input grammars
 ;;
-;; Copyright (C) 2002-2025 Free Software Foundation, Inc.
+;; Copyright (C) 2002-2026 Free Software Foundation, Inc.
 ;;
 ;; Author: David Ponce <david@dponce.com>
 ;; Created: 26 Aug 2002
diff --git a/admin/grammars/java-tags.wy b/admin/grammars/java-tags.wy
index 16289928fbc..40a18fe9dfe 100644
--- a/admin/grammars/java-tags.wy
+++ b/admin/grammars/java-tags.wy
@@ -1,6 +1,6 @@
 ;;; java-tags.wy -- Semantic LALR grammar for Java
 
-;; Copyright (C) 2002-2025 Free Software Foundation, Inc.
+;; Copyright (C) 2002-2026 Free Software Foundation, Inc.
 ;;
 ;; Author: David Ponce <david@dponce.com>
 ;; Created: 26 Aug 2002
diff --git a/admin/grammars/js.wy b/admin/grammars/js.wy
index 0b2ec6176f6..761da0d9d07 100644
--- a/admin/grammars/js.wy
+++ b/admin/grammars/js.wy
@@ -1,6 +1,6 @@
 ;;; javascript-jv.wy -- LALR grammar for Javascript
 
-;; Copyright (C) 2005-2025 Free Software Foundation, Inc.
+;; Copyright (C) 2005-2026 Free Software Foundation, Inc.
 ;; Copyright (C) 1998-2011 Ecma International.
 
 ;; Author: Joakim Verona
diff --git a/admin/grammars/make.by b/admin/grammars/make.by
index a77f22669e6..6547b202f06 100644
--- a/admin/grammars/make.by
+++ b/admin/grammars/make.by
@@ -1,6 +1,6 @@
 ;;; make.by -- BY notation for Makefiles.
 
-;; Copyright (C) 1999-2025 Free Software Foundation, Inc.
+;; Copyright (C) 1999-2026 Free Software Foundation, Inc.
 ;;
 ;; Author: Eric M. Ludlam <zappo@gnu.org>
 ;;         David Ponce <david@dponce.com>
diff --git a/admin/grammars/python.wy b/admin/grammars/python.wy
index 8046461c3cc..0001843d755 100644
--- a/admin/grammars/python.wy
+++ b/admin/grammars/python.wy
@@ -1,6 +1,6 @@
 ;;; python.wy -- LALR grammar for Python
 
-;; Copyright (C) 2002-2025 Free Software Foundation, Inc.
+;; Copyright (C) 2002-2026 Free Software Foundation, Inc.
 ;; Copyright (c) 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008,
 ;; 2009, 2010 Python Software Foundation; All Rights Reserved
 
diff --git a/admin/grammars/scheme.by b/admin/grammars/scheme.by
index da3007bf224..91b7204fd64 100644
--- a/admin/grammars/scheme.by
+++ b/admin/grammars/scheme.by
@@ -1,6 +1,6 @@
 ;;; scheme.by -- Scheme BNF language specification
 
-;; Copyright (C) 2001-2025 Free Software Foundation, Inc.
+;; Copyright (C) 2001-2026 Free Software Foundation, Inc.
 
 ;; This file is part of GNU Emacs.
 
diff --git a/admin/grammars/srecode-template.wy b/admin/grammars/srecode-template.wy
index c0e1f64d597..fd2d5aed3fd 100644
--- a/admin/grammars/srecode-template.wy
+++ b/admin/grammars/srecode-template.wy
@@ -1,6 +1,6 @@
 ;;; srecode-template.wy --- Semantic Recoder Template parser
 
-;; Copyright (C) 2005-2025 Free Software Foundation, Inc.
+;; Copyright (C) 2005-2026 Free Software Foundation, Inc.
 
 ;; Author: Eric M. Ludlam <zappo@gnu.org>
 ;; Keywords: syntax
diff --git a/admin/last-chance.el b/admin/last-chance.el
index e96d1354faa..13974e1e5c5 100644
--- a/admin/last-chance.el
+++ b/admin/last-chance.el
@@ -1,6 +1,6 @@
 ;;; last-chance.el --- dangling deterrence     -*- lexical-binding: t; -*-
 
-;; Copyright (C) 2016-2025 Free Software Foundation, Inc.
+;; Copyright (C) 2016-2026 Free Software Foundation, Inc.
 
 ;; Author: Thien-Thi Nguyen <ttn@gnu.org>
 ;; Maintainer: emacs-devel@gnu.org
diff --git a/admin/make-emacs b/admin/make-emacs
index 15ac1876aa8..bf45ba2f479 100755
--- a/admin/make-emacs
+++ b/admin/make-emacs
@@ -2,7 +2,7 @@
 # Build Emacs with various options for profiling, debugging,
 # with and without warnings enabled etc.
 
-# Copyright (C) 2001-2025 Free Software Foundation, Inc.
+# Copyright (C) 2001-2026 Free Software Foundation, Inc.
 
 # This file is part of GNU Emacs.
 
diff --git a/admin/make-manuals b/admin/make-manuals
index ae2347863f6..29fbcebc310 100755
--- a/admin/make-manuals
+++ b/admin/make-manuals
@@ -1,7 +1,7 @@
 #!/bin/bash
 ### make-manuals - create the Emacs manuals to upload to the gnu.org website
 
-## Copyright 2018-2025 Free Software Foundation, Inc.
+## Copyright 2018-2026 Free Software Foundation, Inc.
 
 ## Author: Glenn Morris <rgm@gnu.org>
 ## Maintainer: emacs-devel@gnu.org
diff --git a/admin/merge-gnulib b/admin/merge-gnulib
index 34b1dda1d58..c64c9647d11 100755
--- a/admin/merge-gnulib
+++ b/admin/merge-gnulib
@@ -4,7 +4,7 @@
 #
 #       admin/merge-gnulib
 
-# Copyright 2012-2025 Free Software Foundation, Inc.
+# Copyright 2012-2026 Free Software Foundation, Inc.
 
 # This file is part of GNU Emacs.
 
diff --git a/admin/merge-pkg-config b/admin/merge-pkg-config
index 75a8b7c7c2b..eb697fd8498 100755
--- a/admin/merge-pkg-config
+++ b/admin/merge-pkg-config
@@ -4,7 +4,7 @@
 #
 #       admin/merge-pkg-config
 
-# Copyright 2014-2025 Free Software Foundation, Inc.
+# Copyright 2014-2026 Free Software Foundation, Inc.
 
 # This file is part of GNU Emacs.
 
diff --git a/admin/notes/copyright b/admin/notes/copyright
index bf1687085e3..4ae98746b2e 100644
--- a/admin/notes/copyright
+++ b/admin/notes/copyright
@@ -1,4 +1,4 @@
-Copyright (C) 2007-2025 Free Software Foundation, Inc.
+Copyright (C) 2007-2026 Free Software Foundation, Inc.
 See the end of the file for license conditions.
 
 
@@ -7,7 +7,7 @@ NOTES ON COPYRIGHTS AND LICENSES
 Some terminology:
 
 A "copyright notice" consists of one or a few lines of this format:
-"Copyright (C) 2007-2025 Free Software Foundation, Inc."
+"Copyright (C) 2007-2026 Free Software Foundation, Inc."
 
 A "license notice" is a statement of permissions, and is usually much
 longer, eg the text "GNU Emacs is free software...".
diff --git a/admin/notes/emba b/admin/notes/emba
index 515edd3435f..4bf6f3a9c76 100644
--- a/admin/notes/emba
+++ b/admin/notes/emba
@@ -1,6 +1,6 @@
 -*- mode: outline; coding: utf-8 -*-
 
-Copyright (C) 2019-2025 Free Software Foundation, Inc.
+Copyright (C) 2019-2026 Free Software Foundation, Inc.
 See the end of the file for license conditions.
 
 NOTES FOR EMACS CONTINUOUS BUILD ON EMBA
diff --git a/admin/notes/hydra b/admin/notes/hydra
index 2c29cd73afb..344df286cf6 100644
--- a/admin/notes/hydra
+++ b/admin/notes/hydra
@@ -1,6 +1,6 @@
 -*- mode: outline; coding: utf-8 -*-
 
-Copyright (C) 2013-2025 Free Software Foundation, Inc.
+Copyright (C) 2013-2026 Free Software Foundation, Inc.
 See the end of the file for license conditions.
 
 NOTES FOR EMACS CONTINUOUS BUILD ON HYDRA
diff --git a/admin/notes/java b/admin/notes/java
index 6895632be32..61777fe67a2 100644
--- a/admin/notes/java
+++ b/admin/notes/java
@@ -1,5 +1,5 @@
 Installation instructions for Android
-Copyright (C) 2023-2025 Free Software Foundation, Inc.
+Copyright (C) 2023-2026 Free Software Foundation, Inc.
 See the end of the file for license conditions.
 
 
diff --git a/admin/notes/multi-tty b/admin/notes/multi-tty
index 11ff90ceb5d..7783eb395e7 100644
--- a/admin/notes/multi-tty
+++ b/admin/notes/multi-tty
@@ -1,6 +1,6 @@
 -*- coding: utf-8; mode: text; -*-
 
-Copyright (C) 2007-2025 Free Software Foundation, Inc.
+Copyright (C) 2007-2026 Free Software Foundation, Inc.
 See the end of the file for license conditions.
 
 From README.multi-tty in the multi-tty branch.
diff --git a/admin/notes/unicode b/admin/notes/unicode
index 21ce2c4cda3..054b54e319e 100644
--- a/admin/notes/unicode
+++ b/admin/notes/unicode
@@ -1,6 +1,6 @@
                                             -*-mode: text; coding: utf-8;-*-
 
-Copyright (C) 2002-2025 Free Software Foundation, Inc.
+Copyright (C) 2002-2026 Free Software Foundation, Inc.
 See the end of the file for license conditions.
 
 Importing a new Unicode Standard version into Emacs
diff --git a/admin/notes/www b/admin/notes/www
index 369b3657bd6..47bea4375ce 100644
--- a/admin/notes/www
+++ b/admin/notes/www
@@ -1,6 +1,6 @@
 -*- outline -*-
 
-Copyright (C) 2013-2025 Free Software Foundation, Inc.
+Copyright (C) 2013-2026 Free Software Foundation, Inc.
 See the end of the file for license conditions.
 
 NOTES FOR EMACS WWW PAGES
diff --git a/admin/notes/years b/admin/notes/years
index 9c0b9a81886..7b3fad97556 100644
--- a/admin/notes/years
+++ b/admin/notes/years
@@ -9,22 +9,18 @@ results for plausibility, then commit them.
 
 A few known problems with the build-aux/update-copyright script:
 
-  . it doesn't update config.bat, msdos/depfiles.bat,
-    nt/configure.bat, etc/tutorials/TUTORIAL.cn,
-    etc/tutorials/TUTORIAL.el_GR, etc/tutorials/TUTORIAL.he,
-    because the "Copyright" statement begins in these files
-    after a prefix that is more than 5 characters long
-  . it doesn't update etc/tutorials/TUTORIAL.nl,
-    etc/tutorials/TUTORIAL.ro, and msdos/autogen/Makefile.in,
-    for some reason
+  . it doesn't update config.bat, msdos/depfiles.bat, nt/configure.bat,
+    etc/tutorials/TUTORIAL.el_GR, etc/tutorials/TUTORIAL.he, because the
+    "Copyright" statement begins in these files after a prefix that is
+    more than 5 characters long
   . it doesn't update the second Copyright notice, the one that gets
     output into PDF and PS, in etc/refcards/ru-refcard.tex
+  . it doesn't update the copyright year down in the output of
+    lib-src/rcs2log and msdos/sed2v2.inp
   . it doesn't update etc/refcards/gnus-refcard.tex, doc/misc/org.org,
     nt/emacs.rc.in, and nt/emacsclient.rc.in, because their Copyright
     statements have a non-standard format
-  . several README files under etc/images/, and also
-    etc/refcards/README, msdos/README, and nt/icons/README aren't
-    updated either
+  . several README files under etc/images/ aren't updated either
   . the copyright notices for headers generated by configure.ac and
     exec/configure.ac are not updated as the files already bear notices
     above them
diff --git a/admin/nt/README-UNDUMP.W32 b/admin/nt/README-UNDUMP.W32
index 91fe51671fc..de56f94caf0 100644
--- a/admin/nt/README-UNDUMP.W32
+++ b/admin/nt/README-UNDUMP.W32
@@ -1,4 +1,4 @@
-Copyright (C) 2001-2025 Free Software Foundation, Inc.
+Copyright (C) 2001-2026 Free Software Foundation, Inc.
 See the end of the file for license conditions.
 
                            Emacs for Windows
diff --git a/admin/nt/dist-build/README-windows-binaries b/admin/nt/dist-build/README-windows-binaries
index b42c00e1912..50b2244147c 100644
--- a/admin/nt/dist-build/README-windows-binaries
+++ b/admin/nt/dist-build/README-windows-binaries
@@ -1,4 +1,4 @@
-Copyright (C) 2001-2025 Free Software Foundation, Inc.
+Copyright (C) 2001-2026 Free Software Foundation, Inc.
 See the end of the file for license conditions.
 
                       Precompiled Distributions of
diff --git a/admin/nt/dist-build/build-dep-zips.py b/admin/nt/dist-build/build-dep-zips.py
index af3036eb8e6..5c760fb21ce 100755
--- a/admin/nt/dist-build/build-dep-zips.py
+++ b/admin/nt/dist-build/build-dep-zips.py
@@ -1,6 +1,6 @@
 #!/usr/bin/python3
 
-## Copyright (C) 2017-2025 Free Software Foundation, Inc.
+## Copyright (C) 2017-2026 Free Software Foundation, Inc.
 
 ## This file is part of GNU Emacs.
 
diff --git a/admin/nt/dist-build/build-zips.sh b/admin/nt/dist-build/build-zips.sh
index 53b41ef6b49..f825cb53fa7 100755
--- a/admin/nt/dist-build/build-zips.sh
+++ b/admin/nt/dist-build/build-zips.sh
@@ -1,6 +1,6 @@
 #!/bin/bash
 
-## Copyright (C) 2017-2025 Free Software Foundation, Inc.
+## Copyright (C) 2017-2026 Free Software Foundation, Inc.
 
 ## This file is part of GNU Emacs.
 
diff --git a/admin/quick-install-emacs b/admin/quick-install-emacs
index 5453456d09c..dcc34f914c7 100755
--- a/admin/quick-install-emacs
+++ b/admin/quick-install-emacs
@@ -1,7 +1,7 @@
 #!/bin/sh
 ### quick-install-emacs --- do a halfway-decent job of installing emacs quickly
 
-## Copyright (C) 2001-2025 Free Software Foundation, Inc.
+## Copyright (C) 2001-2026 Free Software Foundation, Inc.
 
 ## Author: Miles Bader <miles@gnu.org>
 
diff --git a/admin/run-codespell b/admin/run-codespell
index f5728f831f0..48ac8f6c707 100755
--- a/admin/run-codespell
+++ b/admin/run-codespell
@@ -1,7 +1,7 @@
 #!/usr/bin/env bash
 ### run-codespell - run codespell on Emacs
 
-## Copyright (C) 2023-2025 Free Software Foundation, Inc.
+## Copyright (C) 2023-2026 Free Software Foundation, Inc.
 
 ## Author: Stefan Kangas <stefankangas@gmail.com>
 
diff --git a/admin/syncdoc-type-hierarchy.el b/admin/syncdoc-type-hierarchy.el
index e58675c6e3c..579a4cca751 100644
--- a/admin/syncdoc-type-hierarchy.el
+++ b/admin/syncdoc-type-hierarchy.el
@@ -1,6 +1,6 @@
 ;;;  syncdoc-type-hierarchy.el--- -*- lexical-binding: t -*-
 
-;; Copyright (C) 2023-2025 Free Software Foundation, Inc.
+;; Copyright (C) 2023-2026 Free Software Foundation, Inc.
 
 ;; Author: Andrea Corallo <acorallo@gnu.org>
 ;; Keywords: documentation
diff --git a/admin/tree-sitter/treesit-admin.el b/admin/tree-sitter/treesit-admin.el
index a76e105e908..c15768a9c0d 100644
--- a/admin/tree-sitter/treesit-admin.el
+++ b/admin/tree-sitter/treesit-admin.el
@@ -1,6 +1,6 @@
 ;;; treesit-admin.el --- Tree-sitter related admin scripts  -*- lexical-binding: t; -*-
 
-;; Copyright (C) 2024-2025 Free Software Foundation, Inc.
+;; Copyright (C) 2024-2026 Free Software Foundation, Inc.
 
 ;; Maintainer: 付禹安 (Yuan Fu) <casouri@gmail.com>
 ;; Keywords: maint
diff --git a/admin/unidata/Makefile.in b/admin/unidata/Makefile.in
index 223d3fe9cab..b954990cf9e 100644
--- a/admin/unidata/Makefile.in
+++ b/admin/unidata/Makefile.in
@@ -1,6 +1,6 @@
 ### @configure_input@
 
-# Copyright (C) 2012-2025 Free Software Foundation, Inc.
+# Copyright (C) 2012-2026 Free Software Foundation, Inc.
 
 # Copyright (C) 2005, 2006, 2007, 2008, 2009, 2010, 2011
 #   National Institute of Advanced Industrial Science and Technology (AIST)
diff --git a/admin/unidata/blocks.awk b/admin/unidata/blocks.awk
index 3d7041c4ce4..477f0c725bd 100755
--- a/admin/unidata/blocks.awk
+++ b/admin/unidata/blocks.awk
@@ -1,6 +1,6 @@
 #!/usr/bin/awk -f
 
-## Copyright (C) 2015-2025 Free Software Foundation, Inc.
+## Copyright (C) 2015-2026 Free Software Foundation, Inc.
 
 ## Author: Glenn Morris <rgm@gnu.org>
 ## Maintainer: emacs-devel@gnu.org
diff --git a/admin/unidata/emoji-zwj.awk b/admin/unidata/emoji-zwj.awk
index 5eccb7af4a9..1cb7508e443 100644
--- a/admin/unidata/emoji-zwj.awk
+++ b/admin/unidata/emoji-zwj.awk
@@ -1,6 +1,6 @@
 #!/usr/bin/awk -f
 
-## Copyright (C) 2020, 2022-2025 Free Software Foundation, Inc.
+## Copyright (C) 2020, 2022-2026 Free Software Foundation, Inc.
 
 ## Author: Robert Pluim <rpluim@gmail.com>
 
diff --git a/admin/unidata/unidata-gen.el b/admin/unidata/unidata-gen.el
index ac3328787f0..cdbb7b09bae 100644
--- a/admin/unidata/unidata-gen.el
+++ b/admin/unidata/unidata-gen.el
@@ -1,6 +1,6 @@
 ;;; unidata-gen.el --- Create files containing character property data  -*- lexical-binding:t -*-
 
-;; Copyright (C) 2008-2025 Free Software Foundation, Inc.
+;; Copyright (C) 2008-2026 Free Software Foundation, Inc.
 
 ;; Copyright (C) 2005, 2006, 2007, 2008, 2009, 2010, 2011
 ;;   National Institute of Advanced Industrial Science and Technology (AIST)
diff --git a/admin/unidata/uvs.el b/admin/unidata/uvs.el
index 5e6caec60aa..14a16a609d9 100644
--- a/admin/unidata/uvs.el
+++ b/admin/unidata/uvs.el
@@ -1,6 +1,6 @@
 ;;; uvs.el --- utility for UVS (format 14) cmap subtables in OpenType fonts  -*- lexical-binding:t -*-
 
-;; Copyright (C) 2014-2025 Free Software Foundation, Inc.
+;; Copyright (C) 2014-2026 Free Software Foundation, Inc.
 
 ;; Author: YAMAMOTO Mitsuharu <mituharu@math.s.chiba-u.ac.jp>
 
diff --git a/admin/update-copyright b/admin/update-copyright
index fd1396e60e2..e4d50d5baa3 100755
--- a/admin/update-copyright
+++ b/admin/update-copyright
@@ -7,7 +7,7 @@
 # By default, this script uses the local-time calendar year.
 # Set the UPDATE_COPYRIGHT_YEAR environment variable to override the default.
 
-# Copyright 2013-2025 Free Software Foundation, Inc.
+# Copyright 2013-2026 Free Software Foundation, Inc.
 
 # This file is part of GNU Emacs.
 
diff --git a/admin/update_autogen b/admin/update_autogen
index 06f930175be..f785118e12c 100755
--- a/admin/update_autogen
+++ b/admin/update_autogen
@@ -1,7 +1,7 @@
 #!/usr/bin/env bash
 ### update_autogen - update some auto-generated files in the Emacs tree
 
-## Copyright (C) 2011-2025 Free Software Foundation, Inc.
+## Copyright (C) 2011-2026 Free Software Foundation, Inc.
 
 ## Author: Glenn Morris <rgm@gnu.org>
 ## Maintainer: Stefan Kangas <stefankangas@gmail.com>
diff --git a/admin/upload-manuals b/admin/upload-manuals
index 3624a7ed3a7..d8fa0a33892 100755
--- a/admin/upload-manuals
+++ b/admin/upload-manuals
@@ -2,7 +2,7 @@
 
 ### upload-manuals - upload the Emacs manuals to the gnu.org website
 
-## Copyright 2018-2025 Free Software Foundation, Inc.
+## Copyright 2018-2026 Free Software Foundation, Inc.
 
 ## Author: Glenn Morris <rgm@gnu.org>
 ## Maintainer: emacs-devel@gnu.org