Update year
diff --git a/tools/dockerfile/grpc_base/Dockerfile b/tools/dockerfile/grpc_base/Dockerfile
index a291bc9..d2b5569 100644
--- a/tools/dockerfile/grpc_base/Dockerfile
+++ b/tools/dockerfile/grpc_base/Dockerfile
@@ -1,4 +1,4 @@
-# Copyright 2014, Google Inc.
+# Copyright 2015, Google Inc.
 # All rights reserved.
 #
 # Redistribution and use in source and binary forms, with or without