diff --git a/Hack/Middleware/Jsonp.hs b/Hack/Middleware/Jsonp.hs
--- a/Hack/Middleware/Jsonp.hs
+++ b/Hack/Middleware/Jsonp.hs
@@ -46,7 +46,6 @@
                         }
     res <- app env'
     let ctype = fromMaybe "" $ lookup "Content-Type" $ headers res
-    putStrLn $ "callback: " ++ show callback ++ ", ctype: " ++ show ctype ++ ", accept: " ++ accept
     case callback of
         Nothing -> return res
         Just c ->
diff --git a/hack-middleware-jsonp.cabal b/hack-middleware-jsonp.cabal
--- a/hack-middleware-jsonp.cabal
+++ b/hack-middleware-jsonp.cabal
@@ -1,5 +1,5 @@
 name:            hack-middleware-jsonp
-version:         0.0.1
+version:         0.0.2
 license:         BSD3
 license-file:    LICENSE
 author:          Michael Snoyman <michael@snoyman.com>
@@ -12,7 +12,10 @@
 homepage:        http://github.com/snoyberg/hack-middleware-jsonp/tree/master
 
 library
-    build-depends:   base >= 3, bytestring >= 0.9.1.4, bytestring-class,
-                     web-encodings, hack >= 2009.5.19
+    build-depends:   base >= 3 && < 5,
+                     bytestring >= 0.9.1.4,
+                     bytestring-class,
+                     web-encodings,
+                     hack >= 2009.5.19
     exposed-modules: Hack.Middleware.Jsonp
     ghc-options:     -Wall