diff --git a/makefiles/targets/tox.mk b/makefiles/targets/tox.mk
index b3a638b..44da921 100644
--- a/makefiles/targets/tox.mk
+++ b/makefiles/targets/tox.mk
@@ -14,7 +14,7 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 #
-# SPDX-FileCopyrightText: 2022 Open Networking Foundation (ONF) and the ONF Contributors
+# SPDX-FileCopyrightText: 2022-2023 Open Networking Foundation (ONF) and the ONF Contributors
 # SPDX-License-Identifier: Apache-2.0
 # -----------------------------------------------------------------------