diff --git a/COPYRIGHT.txt b/COPYRIGHT.txt
index e3ab100..ce39b57 100644
--- a/COPYRIGHT.txt
+++ b/COPYRIGHT.txt
@@ -1,6 +1,6 @@
 
 isbntools - extract, transform and metadata for ISBNs
-Copyright (C) 2014-2021  Alexandre Lima Conde
+Copyright (C) 2014-2023  Alexandre Lima Conde
 SPDX-License-Identifier: LGPL-3.0-or-later
 
 This program is free software: you can redistribute it and/or modify