diff --git a/Gamgine.cabal b/Gamgine.cabal
--- a/Gamgine.cabal
+++ b/Gamgine.cabal
@@ -1,5 +1,5 @@
 name: Gamgine
-version: 0.4
+version: 0.4.1
 cabal-version: >=1.6
 build-type: Simple
 license: BSD3
@@ -39,7 +39,7 @@
         pretty-show >=1.6.7 && <1.7,
         cpphs >=1.18.4 && <1.19,
         filepath >=1.3.0.1 && <1.4,
-        parsec >=3.1.5 && <3.2,
+        parsec ==3.1.5,
         zlib >=0.5.4.1 && <0.6,
         ListZipper >=1.2.0.2 && <1.3,
         composition >=1.0.1.0 && <1.1