diff --git a/AUTHORS b/AUTHORS
index f1863cb..1721c5f 100644
--- a/AUTHORS
+++ b/AUTHORS
@@ -33,7 +33,7 @@ Patrick D'Cruze
 Eli Zaretskii
 
 
-Copyright (C) 2001, 2006, 2009-2013, 2015-2025 Free Software Foundation, Inc.
+Copyright (C) 2001, 2006, 2009-2013, 2015-2026 Free Software Foundation, Inc.
 
 This file is part of GNU diffutils.
 
diff --git a/ChangeLog-2008 b/ChangeLog-2008
index 342b9c6..e38a663 100644
--- a/ChangeLog-2008
+++ b/ChangeLog-2008
@@ -4265,7 +4265,7 @@ Thu Nov  3 16:30:24 1988  Randall Smith  (randy at gluteus.ai.mit.edu)
 
 	-----
 
-	Copyright (C) 1988-1994, 1997-2002, 2004, 2006, 2009-2013, 2015-2025
+	Copyright (C) 1988-1994, 1997-2002, 2004, 2006, 2009-2013, 2015-2026
 	Free Software Foundation, Inc.
 
 	Copying and distribution of this file, with or without
diff --git a/HACKING b/HACKING
index 8d189b3..9cc6d1a 100644
--- a/HACKING
+++ b/HACKING
@@ -568,7 +568,7 @@ Then just open the index.html file (in the generated lcov-html directory)
 in your favorite web browser.
 
 ========================================================================
-Copyright (C) 2009-2013, 2015-2025 Free Software Foundation, Inc.
+Copyright (C) 2009-2013, 2015-2026 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/Makefile.am b/Makefile.am
index a4c1eb2..e0d10e8 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -1,6 +1,6 @@
 # Main Automakefile for GNU diffutils.
 
-# Copyright (C) 2001-2002, 2004, 2006, 2009-2013, 2015-2025 Free Software
+# Copyright (C) 2001-2002, 2004, 2006, 2009-2013, 2015-2026 Free Software
 # Foundation, Inc.
 
 # This program is free software: you can redistribute it and/or modify
diff --git a/NEWS b/NEWS
index 64d9137..a8115f7 100644
--- a/NEWS
+++ b/NEWS
@@ -548,7 +548,7 @@ User-visible changes in version 2.0:
 
 
 
-Copyright (C) 1993-1994, 1998, 2001-2002, 2004, 2006, 2009-2013, 2015-2025 Free
+Copyright (C) 1993-1994, 1998, 2001-2002, 2004, 2006, 2009-2013, 2015-2026 Free
 Software Foundation, Inc.
 
 This file is part of GNU Diffutils.
diff --git a/README b/README
index 1a0f55e..60587c8 100644
--- a/README
+++ b/README
@@ -44,7 +44,7 @@ Please report bugs to <bug-diffutils@gnu.org>.
 
 -----
 
-Copyright (C) 1992, 1998, 2001-2002, 2004, 2009-2013, 2015-2025 Free Software
+Copyright (C) 1992, 1998, 2001-2002, 2004, 2009-2013, 2015-2026 Free Software
 Foundation, Inc.
 
 This file is part of GNU Diffutils.
diff --git a/README-hacking b/README-hacking
index 65cb321..e27f8bd 100644
--- a/README-hacking
+++ b/README-hacking
@@ -119,7 +119,7 @@ diffutils:
 
 -----
 
-Copyright (C) 2002-2025 Free Software Foundation, Inc.
+Copyright (C) 2002-2026 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.conf b/bootstrap.conf
index 6a60d76..5a5beee 100644
--- a/bootstrap.conf
+++ b/bootstrap.conf
@@ -1,6 +1,6 @@
 # Bootstrap configuration.
 
-# Copyright (C) 2006-2013, 2015-2025 Free Software Foundation, Inc.
+# Copyright (C) 2006-2013, 2015-2026 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/cfg.mk b/cfg.mk
index 097a705..fd654f5 100644
--- a/cfg.mk
+++ b/cfg.mk
@@ -1,5 +1,5 @@
 # Customize maint.mk                           -*- makefile -*-
-# Copyright (C) 2003-2013, 2015-2025 Free Software Foundation, Inc.
+# Copyright (C) 2003-2013, 2015-2026 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/configure.ac b/configure.ac
index ff79236..133241e 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1,6 +1,6 @@
 # Configure template for GNU Diffutils.
 
-# Copyright (C) 1994-1995, 1998, 2001-2002, 2004, 2006, 2009-2013, 2015-2025
+# Copyright (C) 1994-1995, 1998, 2001-2002, 2004, 2006, 2009-2013, 2015-2026
 # Free Software Foundation, Inc.
 
 # This program is free software: you can redistribute it and/or modify
diff --git a/doc/Makefile.am b/doc/Makefile.am
index 53e4f7e..5c49aa7 100644
--- a/doc/Makefile.am
+++ b/doc/Makefile.am
@@ -1,6 +1,6 @@
 # Makefile for GNU diffutils documentation.
 
-# Copyright (C) 2001-2002, 2009-2013, 2015-2025 Free Software Foundation, Inc.
+# Copyright (C) 2001-2002, 2009-2013, 2015-2026 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/doc/diffutils.texi b/doc/diffutils.texi
index bff5abc..8e1b0b5 100644
--- a/doc/diffutils.texi
+++ b/doc/diffutils.texi
@@ -17,7 +17,7 @@ and documents the GNU @command{diff}, @command{diff3},
 differences between files and the GNU @command{patch} command for
 using their output to update files.
 
-Copyright @copyright{} 1992--1994, 1998, 2001--2002, 2004, 2006, 2009--2025
+Copyright @copyright{} 1992--1994, 1998, 2001--2002, 2004, 2006, 2009--2026
 Free Software Foundation, Inc.
 
 @quotation
diff --git a/doc/fdl.texi b/doc/fdl.texi
index 6976568..71ef21c 100644
--- a/doc/fdl.texi
+++ b/doc/fdl.texi
@@ -5,7 +5,7 @@
 @c hence no sectioning command or @node.
 
 @display
-Copyright @copyright{} 2000--2002, 2007--2008, 2022--2025 Free Software
+Copyright @copyright{} 2000--2002, 2007--2008, 2022--2026 Free Software
 Foundation, Inc.
 @uref{https://fsf.org/}
 
diff --git a/exgettext b/exgettext
index ef223a9..1755d1a 100755
--- a/exgettext
+++ b/exgettext
@@ -1,7 +1,7 @@
 #! /bin/sh
 # Wrapper around gettext for programs using the msgid convention.
 
-# Copyright (C) 1998, 2001, 2004, 2009-2013, 2015-2025 Free Software
+# Copyright (C) 1998, 2001, 2004, 2009-2013, 2015-2026 Free Software
 # Foundation, Inc.
 
 # Written by Paul Eggert <eggert@twinsun.com>.
diff --git a/lib/Makefile.am b/lib/Makefile.am
index 3b24048..4e38747 100644
--- a/lib/Makefile.am
+++ b/lib/Makefile.am
@@ -1,6 +1,6 @@
 # Automakefile for GNU Diffutils library.
 
-# Copyright (C) 2001-2002, 2004, 2006, 2009-2013, 2015-2025 Free Software
+# Copyright (C) 2001-2002, 2004, 2006, 2009-2013, 2015-2026 Free Software
 # Foundation, Inc.
 
 # This program is free software: you can redistribute it and/or modify
diff --git a/lib/cmpbuf.c b/lib/cmpbuf.c
index 8094a35..d3739b6 100644
--- a/lib/cmpbuf.c
+++ b/lib/cmpbuf.c
@@ -1,6 +1,6 @@
 /* Buffer primitives for comparison operations.
 
-   Copyright (C) 1993, 1995, 1998, 2001-2002, 2006, 2009-2013, 2015-2025 Free
+   Copyright (C) 1993, 1995, 1998, 2001-2002, 2006, 2009-2013, 2015-2026 Free
    Software Foundation, Inc.
 
    This program is free software: you can redistribute it and/or modify
diff --git a/lib/cmpbuf.h b/lib/cmpbuf.h
index 505934c..1e8336a 100644
--- a/lib/cmpbuf.h
+++ b/lib/cmpbuf.h
@@ -1,6 +1,6 @@
 /* Buffer primitives for comparison operations.
 
-   Copyright (C) 2002, 2009-2013, 2015-2025 Free Software Foundation, Inc.
+   Copyright (C) 2002, 2009-2013, 2015-2026 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/lib/diagnose.c b/lib/diagnose.c
index 58a1e42..df57701 100644
--- a/lib/diagnose.c
+++ b/lib/diagnose.c
@@ -1,6 +1,6 @@
 /* Diagnostics for GNU diffutils
 
-   Copyright 2023-2025 Free Software Foundation, Inc.
+   Copyright 2023-2026 Free Software Foundation, Inc.
 
    This file is part of GNU DIFF.
 
diff --git a/man/Makefile.am b/man/Makefile.am
index 684954b..2e74b4a 100644
--- a/man/Makefile.am
+++ b/man/Makefile.am
@@ -1,6 +1,6 @@
 # Automakefile for GNU diffutils man pages
 
-# Copyright (C) 2002, 2009-2013, 2015-2025 Free Software Foundation, Inc.
+# Copyright (C) 2002, 2009-2013, 2015-2026 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/po/POTFILES.in b/po/POTFILES.in
index 4555213..12ec6df 100644
--- a/po/POTFILES.in
+++ b/po/POTFILES.in
@@ -1,6 +1,6 @@
 # List of files that contain translatable strings.
 
-# Copyright (C) 2001-2002, 2009-2013, 2015-2025 Free Software Foundation, Inc.
+# Copyright (C) 2001-2002, 2009-2013, 2015-2026 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/src/Makefile.am b/src/Makefile.am
index 1cac35c..ea339fb 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -1,6 +1,6 @@
 # Automakefile for GNU diffutils programs.
 
-# Copyright (C) 2001-2002, 2006, 2009-2013, 2015-2025 Free Software Foundation,
+# Copyright (C) 2001-2002, 2006, 2009-2013, 2015-2026 Free Software Foundation,
 # Inc.
 
 # This program is free software: you can redistribute it and/or modify
diff --git a/src/analyze.c b/src/analyze.c
index dae6d00..6c9a768 100644
--- a/src/analyze.c
+++ b/src/analyze.c
@@ -1,7 +1,7 @@
 /* Analyze file differences for GNU DIFF.
 
    Copyright (C) 1988-1989, 1992-1995, 1998, 2001-2002, 2004, 2006-2007,
-   2009-2013, 2015-2025 Free Software Foundation, Inc.
+   2009-2013, 2015-2026 Free Software Foundation, Inc.
 
    This file is part of GNU DIFF.
 
diff --git a/src/cmp.c b/src/cmp.c
index 84d0e8f..ec373d7 100644
--- a/src/cmp.c
+++ b/src/cmp.c
@@ -1,7 +1,7 @@
 /* GNU cmp - compare two files byte by byte
 
    Copyright (C) 1990-1996, 1998, 2001-2002, 2004, 2006-2007, 2009-2013,
-   2015-2025 Free Software Foundation, Inc.
+   2015-2026 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/src/context.c b/src/context.c
index 5719256..25c7659 100644
--- a/src/context.c
+++ b/src/context.c
@@ -1,7 +1,7 @@
 /* Context-format output routines for GNU DIFF.
 
    Copyright (C) 1988-1989, 1991-1995, 1998, 2001-2002, 2004, 2006, 2009-2013,
-   2015-2025 Free Software Foundation, Inc.
+   2015-2026 Free Software Foundation, Inc.
 
    This file is part of GNU DIFF.
 
diff --git a/src/diff.c b/src/diff.c
index 89cd703..f4cd7b8 100644
--- a/src/diff.c
+++ b/src/diff.c
@@ -1,7 +1,7 @@
 /* GNU diff - compare files line by line
 
    Copyright (C) 1988-1989, 1992-1994, 1996, 1998, 2001-2002, 2004, 2006-2007,
-   2009-2013, 2015-2025 Free Software Foundation, Inc.
+   2009-2013, 2015-2026 Free Software Foundation, Inc.
 
    This file is part of GNU DIFF.
 
diff --git a/src/diff.h b/src/diff.h
index aaa2acf..7558f59 100644
--- a/src/diff.h
+++ b/src/diff.h
@@ -1,7 +1,7 @@
 /* Shared definitions for GNU DIFF
 
    Copyright (C) 1988-1989, 1991-1995, 1998, 2001-2002, 2004, 2009-2013,
-   2015-2025 Free Software Foundation, Inc.
+   2015-2026 Free Software Foundation, Inc.
 
    This file is part of GNU DIFF.
 
diff --git a/src/diff3.c b/src/diff3.c
index 82f3237..1dfba37 100644
--- a/src/diff3.c
+++ b/src/diff3.c
@@ -1,7 +1,7 @@
 /* GNU diff3 - compare three files line by line
 
    Copyright (C) 1988-1989, 1992-1996, 1998, 2001-2002, 2004, 2006, 2009-2013,
-   2015-2025 Free Software Foundation, Inc.
+   2015-2026 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/src/dir.c b/src/dir.c
index c94ef00..8903c25 100644
--- a/src/dir.c
+++ b/src/dir.c
@@ -1,7 +1,7 @@
 /* Read, sort and compare two directories.  Used for GNU DIFF.
 
    Copyright (C) 1988-1989, 1992-1995, 1998, 2001-2002, 2004, 2006-2007,
-   2009-2013, 2015-2025 Free Software Foundation, Inc.
+   2009-2013, 2015-2026 Free Software Foundation, Inc.
 
    This file is part of GNU DIFF.
 
diff --git a/src/ed.c b/src/ed.c
index bb9cb2a..7005f1e 100644
--- a/src/ed.c
+++ b/src/ed.c
@@ -1,7 +1,7 @@
 /* Output routines for ed-script format.
 
    Copyright (C) 1988-1989, 1991-1993, 1995, 1998, 2001, 2004, 2006, 2009-2013,
-   2015-2025 Free Software Foundation, Inc.
+   2015-2026 Free Software Foundation, Inc.
 
    This file is part of GNU DIFF.
 
diff --git a/src/ifdef.c b/src/ifdef.c
index 2253cae..311c47b 100644
--- a/src/ifdef.c
+++ b/src/ifdef.c
@@ -1,6 +1,6 @@
 /* #ifdef-format output routines for GNU DIFF.
 
-   Copyright (C) 1989, 1991-1994, 2001-2002, 2004, 2006, 2009-2013, 2015-2025
+   Copyright (C) 1989, 1991-1994, 2001-2002, 2004, 2006, 2009-2013, 2015-2026
    Free Software Foundation, Inc.
 
    This file is part of GNU DIFF.
diff --git a/src/io.c b/src/io.c
index eba4aba..4a06c78 100644
--- a/src/io.c
+++ b/src/io.c
@@ -1,7 +1,7 @@
 /* File I/O for GNU DIFF.
 
    Copyright (C) 1988-1989, 1992-1995, 1998, 2001-2002, 2004, 2006, 2009-2013,
-   2015-2025 Free Software Foundation, Inc.
+   2015-2026 Free Software Foundation, Inc.
 
    This file is part of GNU DIFF.
 
diff --git a/src/normal.c b/src/normal.c
index 304554d..13dad25 100644
--- a/src/normal.c
+++ b/src/normal.c
@@ -1,6 +1,6 @@
 /* Normal-format output routines for GNU DIFF.
 
-   Copyright (C) 1988-1989, 1993, 1995, 1998, 2001, 2006, 2009-2013, 2015-2025
+   Copyright (C) 1988-1989, 1993, 1995, 1998, 2001, 2006, 2009-2013, 2015-2026
    Free Software Foundation, Inc.
 
    This file is part of GNU DIFF.
diff --git a/src/sdiff.c b/src/sdiff.c
index 278b5a2..ceb95b5 100644
--- a/src/sdiff.c
+++ b/src/sdiff.c
@@ -1,7 +1,7 @@
 /* GNU sdiff - side-by-side merge of file differences
 
    Copyright (C) 1992-1996, 1998, 2001-2002, 2004, 2006-2007, 2009-2013,
-   2015-2025 Free Software Foundation, Inc.
+   2015-2026 Free Software Foundation, Inc.
 
    This file is part of GNU DIFF.
 
diff --git a/src/side.c b/src/side.c
index 38b6384..e38c1ac 100644
--- a/src/side.c
+++ b/src/side.c
@@ -1,6 +1,6 @@
 /* sdiff-format output routines for GNU DIFF.
 
-   Copyright (C) 1991-1993, 1998, 2001-2002, 2004, 2009-2013, 2015-2025 Free
+   Copyright (C) 1991-1993, 1998, 2001-2002, 2004, 2009-2013, 2015-2026 Free
    Software Foundation, Inc.
 
    This file is part of GNU DIFF.
diff --git a/src/syncsig.c b/src/syncsig.c
index d01f15b..cf56e3c 100644
--- a/src/syncsig.c
+++ b/src/syncsig.c
@@ -1,6 +1,6 @@
 /* Synchronous signal handling
 
-   Copyright 2025 Free Software Foundation, Inc.
+   Copyright 2025-2026 Free Software Foundation, Inc.
 
    This file is part of GNU DIFF.
 
diff --git a/src/syncsig.h b/src/syncsig.h
index fae2f8e..291e487 100644
--- a/src/syncsig.h
+++ b/src/syncsig.h
@@ -1,6 +1,6 @@
 /* Synchronous signal handling
 
-   Copyright 2025 Free Software Foundation, Inc.
+   Copyright 2025-2026 Free Software Foundation, Inc.
 
    This file is part of GNU DIFF.
 
diff --git a/src/system.c b/src/system.c
index fb12edf..85cbdb2 100644
--- a/src/system.c
+++ b/src/system.c
@@ -1,7 +1,7 @@
 /* System dependent declarations.
 
    Copyright (C) 1988-1989, 1992-1995, 1998, 2001-2002, 2004, 2006, 2009-2013,
-   2015-2025 Free Software Foundation, Inc.
+   2015-2026 Free Software Foundation, Inc.
 
    This file is part of GNU DIFF.
 
diff --git a/src/system.h b/src/system.h
index 19a087d..c118339 100644
--- a/src/system.h
+++ b/src/system.h
@@ -1,7 +1,7 @@
 /* System dependent declarations.
 
    Copyright (C) 1988-1989, 1992-1995, 1998, 2001-2002, 2004, 2006, 2009-2013,
-   2015-2025 Free Software Foundation, Inc.
+   2015-2026 Free Software Foundation, Inc.
 
    This file is part of GNU DIFF.
 
diff --git a/src/util.c b/src/util.c
index a586511..56a4a4e 100644
--- a/src/util.c
+++ b/src/util.c
@@ -1,7 +1,7 @@
 /* Support routines for GNU DIFF.
 
    Copyright (C) 1988-1989, 1992-1995, 1998, 2001-2002, 2004, 2006, 2009-2013,
-   2015-2025 Free Software Foundation, Inc.
+   2015-2026 Free Software Foundation, Inc.
 
    This file is part of GNU DIFF.
 
diff --git a/tests/cmp b/tests/cmp
index b8e4864..76aabfa 100755
--- a/tests/cmp
+++ b/tests/cmp
@@ -1,7 +1,7 @@
 #!/bin/sh
 # Test 'cmp'.
 
-# Copyright 2017-2025 Free Software Foundation, Inc.
+# Copyright 2017-2026 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/tests/envvar-check b/tests/envvar-check
index cd11adf..99b163d 100644
--- a/tests/envvar-check
+++ b/tests/envvar-check
@@ -1,7 +1,7 @@
 # -*- sh -*-
 # Check environment variables for sane values while testing.
 
-# Copyright (C) 2000-2025 Free Software Foundation, Inc.
+# Copyright (C) 2000-2026 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/tests/help-version b/tests/help-version
index 8bb46a1..3c6c696 100755
--- a/tests/help-version
+++ b/tests/help-version
@@ -2,7 +2,7 @@
 # Make sure all these programs work properly
 # when invoked with --help or --version.
 
-# Copyright (C) 2000-2013, 2015-2025 Free Software Foundation, Inc.
+# Copyright (C) 2000-2013, 2015-2026 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/tests/init.cfg b/tests/init.cfg
index 66c26d6..d5cd6d9 100644
--- a/tests/init.cfg
+++ b/tests/init.cfg
@@ -1,6 +1,6 @@
 # This file is sourced by init.sh, *before* its initialization.
 
-# Copyright (C) 2010-2025 Free Software Foundation, Inc.
+# Copyright (C) 2010-2026 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