diff --git a/LICENSE b/LICENSE
index 9c0b41d..b70c6cf 100644
--- a/LICENSE
+++ b/LICENSE
@@ -1,5 +1,4 @@
-Copyright (c) 2012 Yamashita, Yuu
-Copyright (c) 2011 Sam Stephenson
+Copyright (c) 2013 Yamashita, Yuu
 
 Permission is hereby granted, free of charge, to any person obtaining
 a copy of this software and associated documentation files (the
diff --git a/README.md b/README.md
index 0ee3b0e..805e343 100644
--- a/README.md
+++ b/README.md
@@ -63,8 +63,7 @@ under `~/.pyenv/versions`.
 
 (The MIT License)
 
-* Copyright (c) 2012 Yamashita, Yuu
-* Copyright (c) 2011 Sam Stephenson
+* Copyright (c) 2013 Yamashita, Yuu
 
 Permission is hereby granted, free of charge, to any person obtaining
 a copy of this software and associated documentation files (the