diff --git a/LICENSE b/LICENSE
index 33f2a26..eef0e0b 100644
--- a/LICENSE
+++ b/LICENSE
@@ -1,4 +1,4 @@
-Copyright (c) 2014-2016 KUBO Atsuhiro <kubo@iteman.jp>,
+Copyright (c) 2014-2016, 2018 KUBO Atsuhiro <kubo@iteman.jp>,
 All rights reserved.
 
 Redistribution and use in source and binary forms, with or without
diff --git a/README.md b/README.md
index 28053a5..8fe580b 100644
--- a/README.md
+++ b/README.md
@@ -73,7 +73,7 @@ If you find a bug or have a question, or want to request a feature, create an is
 
 ## Copyright
 
-Copyright (c) 2014-2016 KUBO Atsuhiro, All rights reserved.
+Copyright (c) 2014-2016, 2018 KUBO Atsuhiro, All rights reserved.
 
 ## License