diff --git a/makefiles/virtualenv.mk b/makefiles/virtualenv.mk
index 008a372..a8625ae 100644
--- a/makefiles/virtualenv.mk
+++ b/makefiles/virtualenv.mk
@@ -1,6 +1,6 @@
 # -*- makefile -*-
 ## -----------------------------------------------------------------------
-# Copyright 2017-2022 Open Networking Foundation
+# Copyright 2017-2023 Open Networking Foundation
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.