diff --git a/tensorflow_privacy/privacy/optimizers/dp_optimizer.py b/tensorflow_privacy/privacy/optimizers/dp_optimizer.py
index 73e0fd6..83bcff9 100644
--- a/tensorflow_privacy/privacy/optimizers/dp_optimizer.py
+++ b/tensorflow_privacy/privacy/optimizers/dp_optimizer.py
@@ -1,4 +1,4 @@
-# Copyright 2018, The TensorFlow Authors.
+# Copyright 2020, The TensorFlow Authors.
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.