diff --git a/twitter-types.cabal b/twitter-types.cabal
--- a/twitter-types.cabal
+++ b/twitter-types.cabal
@@ -1,5 +1,5 @@
 name:              twitter-types
-version:           0.2.20140406
+version:           0.2.20140407
 license:           BSD3
 license-file:      LICENSE
 author:            Takahiro HIMURA
@@ -45,7 +45,7 @@
     , test-framework-th-prime
     , test-framework-hunit
     , HUnit
-    , shakespeare
+    , shakespeare >= 2.0
     , http-types
     , aeson
     , attoparsec