diff --git a/tools.go b/tools.go
index 58f0e77d2..41be8000d 100644
--- a/tools.go
+++ b/tools.go
@@ -1,4 +1,4 @@
-// Copyright 2021 The Ebitengine Authors
+// Copyright 2022 The Ebitengine Authors
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.