diff --git a/lib/rackstash/encoder/helper/message.rb b/lib/rackstash/encoder/helper/message.rb
index a1df14d..dfe9762 100644
--- a/lib/rackstash/encoder/helper/message.rb
+++ b/lib/rackstash/encoder/helper/message.rb
@@ -1,6 +1,6 @@
 # frozen_string_literal: true
 #
-# Copyright 2017 Holger Just
+# Copyright 2017 - 2018 Holger Just
 #
 # This software may be modified and distributed under the terms
 # of the MIT license. See the LICENSE.txt file for details.
diff --git a/lib/rackstash/encoder/helper/timestamp.rb b/lib/rackstash/encoder/helper/timestamp.rb
index ae5b36e..e35be27 100644
--- a/lib/rackstash/encoder/helper/timestamp.rb
+++ b/lib/rackstash/encoder/helper/timestamp.rb
@@ -1,6 +1,6 @@
 # frozen_string_literal: true
 #
-# Copyright 2017 Holger Just
+# Copyright 2017 - 2018 Holger Just
 #
 # This software may be modified and distributed under the terms
 # of the MIT license. See the LICENSE.txt file for details.