diff --git a/zlib-enum.cabal b/zlib-enum.cabal
--- a/zlib-enum.cabal
+++ b/zlib-enum.cabal
@@ -1,5 +1,5 @@
 name:           zlib-enum
-version:        0.2.2
+version:        0.2.2.1
 license:        MIT
 license-file:   LICENSE
 author:         Paulo Tanimoto <ptanimoto@gmail.com>
@@ -23,8 +23,8 @@
     if flag(test)
          Buildable: False
     build-depends: base                  >= 4 && < 5
-                 , bytestring
-                 , transformers          == 0.2.*
+                 , bytestring            >= 0.9 && < 0.10
+                 , transformers          >= 0.2 && < 0.4
                  , enumerator            == 0.4.*
                  , zlib-bindings         == 0.1.*
     exposed-modules: Codec.Zlib.Enum
@@ -38,7 +38,7 @@
         build-depends:
               base                       >= 4.0   &&   < 5.0
             , bytestring                 >= 0.9   &&   < 0.10
-            , transformers               == 0.2.*
+            , transformers               >= 0.2   &&   < 0.4
             , enumerator                 >= 0.4   &&   < 0.5
             , zlib-bindings              >= 0.1
             , test-framework             >= 0.6   &&   < 0.7