diff --git a/helpers/templates/humamize_duration_test.go b/helpers/templates/humamize_duration_test.go
index ce0dd8ff..426a5977 100644
--- a/helpers/templates/humamize_duration_test.go
+++ b/helpers/templates/humamize_duration_test.go
@@ -1,4 +1,4 @@
-// Copyright 2015 The Prometheus Authors
+// Copyright 2024 The Prometheus Authors
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
 // You may obtain a copy of the License at