diff --git a/lib/chainer/version.rb b/lib/chainer/version.rb
index 778d993..5722c02 100644
--- a/lib/chainer/version.rb
+++ b/lib/chainer/version.rb
@@ -1,4 +1,4 @@
 module Chainer
-  VERSION = "0.3.0"
+  VERSION = "0.3.1"
 end