diff --git a/croniter/_release.py b/croniter/_release.py
index 7a0c1cc..7717968 100644
--- a/croniter/_release.py
+++ b/croniter/_release.py
@@ -1,7 +1,7 @@
 #!/usr/bin/env python
 # -*- coding: utf-8 -*-
 __author__  = "Matsumoto Taichi"
-__version__ = "0.3.0"
+__version__ = "0.3.1"
 __license__ = "MIT License"
 __doc__ = """
     Simple example of usage is followings