diff --git a/clientlog.c b/clientlog.c
index 96cb04e..adf0c59 100644
--- a/clientlog.c
+++ b/clientlog.c
@@ -3,7 +3,7 @@
 
  **********************************************************************
  * Copyright (C) Richard P. Curnow  1997-2003
- * Copyright (C) Miroslav Lichvar  2009, 2015-2017
+ * Copyright (C) Miroslav Lichvar  2009, 2015-2017, 2021
  * 
  * 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/cmdparse.c b/cmdparse.c
index f9fe68e..d8ab61e 100644
--- a/cmdparse.c
+++ b/cmdparse.c
@@ -3,7 +3,7 @@
 
  **********************************************************************
  * Copyright (C) Richard P. Curnow  1997-2003
- * Copyright (C) Miroslav Lichvar  2013-2014, 2016
+ * Copyright (C) Miroslav Lichvar  2013-2014, 2016, 2021
  * 
  * 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 4b75f79..b73309e 100644
--- a/ntp_core.c
+++ b/ntp_core.c
@@ -3,7 +3,7 @@
 
  **********************************************************************
  * Copyright (C) Richard P. Curnow  1997-2003
- * Copyright (C) Miroslav Lichvar  2009-2020
+ * Copyright (C) Miroslav Lichvar  2009-2021
  * 
  * 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.c b/ntp_io.c
index e4eb379..86e3f26 100644
--- a/ntp_io.c
+++ b/ntp_io.c
@@ -4,7 +4,7 @@
  **********************************************************************
  * Copyright (C) Richard P. Curnow  1997-2003
  * Copyright (C) Timo Teras  2009
- * Copyright (C) Miroslav Lichvar  2009, 2013-2016, 2018-2020
+ * Copyright (C) Miroslav Lichvar  2009, 2013-2016, 2018-2021
  * 
  * 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 ce0965f..c439a74 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
+ * Copyright (C) Miroslav Lichvar  2011-2016, 2018, 2020-2021
  * 
  * 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/clientlog.c b/test/unit/clientlog.c
index 2a9a588..f59e130 100644
--- a/test/unit/clientlog.c
+++ b/test/unit/clientlog.c
@@ -1,6 +1,6 @@
 /*
  **********************************************************************
- * Copyright (C) Miroslav Lichvar  2016
+ * Copyright (C) Miroslav Lichvar  2016, 2021
  * 
  * 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 da99f82..c4c8934 100644
--- a/util.c
+++ b/util.c
@@ -3,7 +3,7 @@
 
  **********************************************************************
  * Copyright (C) Richard P. Curnow  1997-2003
- * Copyright (C) Miroslav Lichvar  2009, 2012-2020
+ * Copyright (C) Miroslav Lichvar  2009, 2012-2021
  * 
  * 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