diff --git a/Data/Git.hs b/Data/Git.hs
--- a/Data/Git.hs
+++ b/Data/Git.hs
@@ -23,7 +23,3 @@
 
 iterGitObject :: Iteratee ByteString IO GitObject
 iterGitObject = iterParser gitObject
-
-infixr 0 =$
-(=$) :: Monad m => Enumeratee ao ai m b -> Iteratee ai m b -> Iteratee ao m b
-ee =$ ie = joinI $ ee $$ ie
diff --git a/git-object.cabal b/git-object.cabal
--- a/git-object.cabal
+++ b/git-object.cabal
@@ -1,5 +1,5 @@
 Name:                   git-object
-Version:                0.0.0
+Version:                0.0.1
 Author:                 Kazu Yamamoto <kazu@iij.ad.jp>
 Maintainer:             Kazu Yamamoto <kazu@iij.ad.jp>
 License:                BSD3
@@ -24,7 +24,8 @@
                         Data.Git.Parser
   Build-Depends:        base >= 4 && < 5, bytestring, zlib-enum,
                         filepath, directory,
-                        attoparsec, enumerator, attoparsec-enumerator
+                        enumerator >= 0.4.9,
+                        attoparsec, attoparsec-enumerator
 Source-Repository head
   Type:                 git
   Location:             git://github.com/kazu-yamamoto/git-object.git