diff --git a/setup.cfg b/setup.cfg
index 510eb1fe9..0e3fa7400 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -1,6 +1,6 @@
 [metadata]
 name = blueoil
-version = 0.3.0
+version = 0.4.0
 url = https://blue-oil.org
 author = Blueoil development team
 author_email = test@example.com