diff --git a/include/patchlevel.h b/include/patchlevel.h
index 6b3ee5faf..65b64d320 100644
--- a/include/patchlevel.h
+++ b/include/patchlevel.h
@@ -36,7 +36,7 @@
 #define DEBUG
 #endif
 
-#define COPYRIGHT_BANNER_A "NetHack, Copyright 1985-2022"
+#define COPYRIGHT_BANNER_A "NetHack, Copyright 1985-2023"
 #define COPYRIGHT_BANNER_B \
     "         By Stichting Mathematisch Centrum and M. Stephenson."
 /* nomakedefs.copyright_banner_c is generated at runtime */