diff --git a/COPYRIGHT b/COPYRIGHT
index af07772..7fe340d 100644
--- a/COPYRIGHT
+++ b/COPYRIGHT
@@ -1,4 +1,4 @@
-Copyright (c) 2012-2021 Grzegorz Blach. All rights reserved.
+Copyright (c) 2012-2023 Grzegorz Blach. All rights reserved.
 
 Redistribution and use in source and binary forms, with or without
 modification, are permitted provided that the following conditions