diff --git a/beliefRevisionGames.nimble b/beliefRevisionGames.nimble
index 2232d57..ce6f4f2 100644
--- a/beliefRevisionGames.nimble
+++ b/beliefRevisionGames.nimble
@@ -1,6 +1,6 @@
 # Package
 
-version       = "0.3.0"
+version       = "0.4.0"
 author        = "Azumabashi"
 description   = "Unofficial implemention of belief revision games"
 license       = "MIT"