diff --git a/src/regsyntax.c b/src/regsyntax.c
index a5b2dba3..1a57f55c 100644
--- a/src/regsyntax.c
+++ b/src/regsyntax.c
@@ -2,7 +2,7 @@
   regsyntax.c -  Oniguruma (regular expression library)
 **********************************************************************/
 /*-
- * Copyright (c) 2002-2021  K.Kosako
+ * Copyright (c) 2002-2024  K.Kosako
  * All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without