diff --git a/client.c b/client.c
index 97c842f..5c056bc 100644
--- a/client.c
+++ b/client.c
@@ -4,7 +4,7 @@
  **********************************************************************
  * Copyright (C) Richard P. Curnow  1997-2003
  * Copyright (C) Lonnie Abelbeck  2016, 2018
- * Copyright (C) Miroslav Lichvar  2009-2021
+ * Copyright (C) Miroslav Lichvar  2009-2023
  * 
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of version 2 of the GNU General Public License as
@@ -3380,7 +3380,7 @@ static void
 display_gpl(void)
 {
     printf("chrony version %s\n"
-           "Copyright (C) 1997-2003, 2007, 2009-2022 Richard P. Curnow and others\n"
+           "Copyright (C) 1997-2003, 2007, 2009-2023 Richard P. Curnow and others\n"
            "chrony comes with ABSOLUTELY NO WARRANTY.  This is free software, and\n"
            "you are welcome to redistribute it under certain conditions.  See the\n"
            "GNU General Public License version 2 for details.\n\n",
diff --git a/cmdmon.c b/cmdmon.c
index 588b400..c2c5bf0 100644
--- a/cmdmon.c
+++ b/cmdmon.c
@@ -3,7 +3,7 @@
 
  **********************************************************************
  * Copyright (C) Richard P. Curnow  1997-2003
- * Copyright (C) Miroslav Lichvar  2009-2016, 2018-2021
+ * Copyright (C) Miroslav Lichvar  2009-2016, 2018-2023
  * 
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of version 2 of the GNU General Public License as
diff --git a/configure b/configure
index d4ab9b5..81bb4b8 100755
--- a/configure
+++ b/configure
@@ -5,7 +5,7 @@
 #
 # Copyright (C) Richard P. Curnow  1997-2003
 # Copyright (C) Bryan Christianson  2016
-# Copyright (C) Miroslav Lichvar  2009, 2012-2021
+# Copyright (C) Miroslav Lichvar  2009, 2012-2022
 # Copyright (C) Stefan R. Filipek  2019
 #
 # =======================================================================
diff --git a/doc/chrony.conf.adoc b/doc/chrony.conf.adoc
index e4d6118..9d7f485 100644
--- a/doc/chrony.conf.adoc
+++ b/doc/chrony.conf.adoc
@@ -3,7 +3,7 @@
 // Copyright (C) Richard P. Curnow  1997-2003
 // Copyright (C) Stephen Wadeley  2016
 // Copyright (C) Bryan Christianson  2017
-// Copyright (C) Miroslav Lichvar  2009-2022
+// Copyright (C) Miroslav Lichvar  2009-2023
 //
 // This program is free software; you can redistribute it and/or modify
 // it under the terms of version 2 of the GNU General Public License as
diff --git a/doc/chronyc.adoc b/doc/chronyc.adoc
index 3bbebca..46315f0 100644
--- a/doc/chronyc.adoc
+++ b/doc/chronyc.adoc
@@ -2,7 +2,7 @@
 //
 // Copyright (C) Richard P. Curnow  1997-2003
 // Copyright (C) Stephen Wadeley  2016
-// Copyright (C) Miroslav Lichvar  2009-2017, 2019-2022
+// Copyright (C) Miroslav Lichvar  2009-2017, 2019-2023
 //
 // This program is free software; you can redistribute it and/or modify
 // it under the terms of version 2 of the GNU General Public License as
diff --git a/doc/faq.adoc b/doc/faq.adoc
index ac8961f..a0524e0 100644
--- a/doc/faq.adoc
+++ b/doc/faq.adoc
@@ -1,7 +1,7 @@
 // This file is part of chrony
 //
 // Copyright (C) Richard P. Curnow  1997-2003
-// Copyright (C) Miroslav Lichvar  2014-2016, 2020-2022
+// Copyright (C) Miroslav Lichvar  2014-2016, 2020-2023
 //
 // This program is free software; you can redistribute it and/or modify
 // it under the terms of version 2 of the GNU General Public License as
diff --git a/ntp_core.c b/ntp_core.c
index 9128d77..73519a3 100644
--- a/ntp_core.c
+++ b/ntp_core.c
@@ -3,7 +3,7 @@
 
  **********************************************************************
  * Copyright (C) Richard P. Curnow  1997-2003
- * Copyright (C) Miroslav Lichvar  2009-2022
+ * Copyright (C) Miroslav Lichvar  2009-2023
  * 
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of version 2 of the GNU General Public License as
diff --git a/ntp_io_linux.c b/ntp_io_linux.c
index 1fc509d..6988a28 100644
--- a/ntp_io_linux.c
+++ b/ntp_io_linux.c
@@ -2,7 +2,7 @@
   chronyd/chronyc - Programs for keeping computer clocks accurate.
 
  **********************************************************************
- * Copyright (C) Miroslav Lichvar  2016-2019, 2021-2022
+ * Copyright (C) Miroslav Lichvar  2016-2019, 2021-2023
  * 
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of version 2 of the GNU General Public License as
diff --git a/ntp_sources.c b/ntp_sources.c
index d0bc75f..28af1c1 100644
--- a/ntp_sources.c
+++ b/ntp_sources.c
@@ -3,7 +3,7 @@
 
  **********************************************************************
  * Copyright (C) Richard P. Curnow  1997-2003
- * Copyright (C) Miroslav Lichvar  2011-2012, 2014, 2016, 2020-2021
+ * Copyright (C) Miroslav Lichvar  2011-2012, 2014, 2016, 2020-2023
  * 
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of version 2 of the GNU General Public License as
diff --git a/nts_ke_server.c b/nts_ke_server.c
index 446c363..5e25c50 100644
--- a/nts_ke_server.c
+++ b/nts_ke_server.c
@@ -2,7 +2,7 @@
   chronyd/chronyc - Programs for keeping computer clocks accurate.
 
  **********************************************************************
- * Copyright (C) Miroslav Lichvar  2020
+ * Copyright (C) Miroslav Lichvar  2020, 2022
  * 
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of version 2 of the GNU General Public License as
diff --git a/nts_ntp_server.c b/nts_ntp_server.c
index 7db3998..be69a2b 100644
--- a/nts_ntp_server.c
+++ b/nts_ntp_server.c
@@ -2,7 +2,7 @@
   chronyd/chronyc - Programs for keeping computer clocks accurate.
 
  **********************************************************************
- * Copyright (C) Miroslav Lichvar  2020
+ * Copyright (C) Miroslav Lichvar  2020, 2022
  * 
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of version 2 of the GNU General Public License as
diff --git a/refclock_phc.c b/refclock_phc.c
index 3b68c84..abda2e8 100644
--- a/refclock_phc.c
+++ b/refclock_phc.c
@@ -2,7 +2,7 @@
   chronyd/chronyc - Programs for keeping computer clocks accurate.
 
  **********************************************************************
- * Copyright (C) Miroslav Lichvar  2013, 2017
+ * Copyright (C) Miroslav Lichvar  2013, 2017, 2023
  * 
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of version 2 of the GNU General Public License as
diff --git a/siv_nettle.c b/siv_nettle.c
index 800beb7..a8cba49 100644
--- a/siv_nettle.c
+++ b/siv_nettle.c
@@ -2,7 +2,7 @@
   chronyd/chronyc - Programs for keeping computer clocks accurate.
 
  **********************************************************************
- * Copyright (C) Miroslav Lichvar  2019
+ * Copyright (C) Miroslav Lichvar  2019, 2022
  * 
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of version 2 of the GNU General Public License as
diff --git a/sources.c b/sources.c
index 0d6b1c0..261d31d 100644
--- a/sources.c
+++ b/sources.c
@@ -3,7 +3,7 @@
 
  **********************************************************************
  * Copyright (C) Richard P. Curnow  1997-2003
- * Copyright (C) Miroslav Lichvar  2011-2016, 2018, 2020-2021
+ * Copyright (C) Miroslav Lichvar  2011-2016, 2018, 2020-2023
  * 
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of version 2 of the GNU General Public License as
diff --git a/test/unit/ntp_core.c b/test/unit/ntp_core.c
index 83c832c..7d64986 100644
--- a/test/unit/ntp_core.c
+++ b/test/unit/ntp_core.c
@@ -1,6 +1,6 @@
 /*
  **********************************************************************
- * Copyright (C) Miroslav Lichvar  2017-2018
+ * Copyright (C) Miroslav Lichvar  2017-2018, 2023
  * 
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of version 2 of the GNU General Public License as
diff --git a/util.c b/util.c
index 6b3320b..a240e3e 100644
--- a/util.c
+++ b/util.c
@@ -3,7 +3,7 @@
 
  **********************************************************************
  * Copyright (C) Richard P. Curnow  1997-2003
- * Copyright (C) Miroslav Lichvar  2009, 2012-2021
+ * Copyright (C) Miroslav Lichvar  2009, 2012-2023
  * 
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of version 2 of the GNU General Public License as