diff --git a/Network/Wai/Middleware/Static.hs b/Network/Wai/Middleware/Static.hs
--- a/Network/Wai/Middleware/Static.hs
+++ b/Network/Wai/Middleware/Static.hs
@@ -119,7 +119,7 @@
     maybe (app req)
           (\fp -> do exists <- liftIO $ doesFileExist fp
                      if exists
-                        then return $ ResponseFile status200
+                        then return $ responseFile status200
                                                    [("Content-Type", getMimeType fp)]
                                                    fp
                                                    Nothing
diff --git a/wai-middleware-static.cabal b/wai-middleware-static.cabal
--- a/wai-middleware-static.cabal
+++ b/wai-middleware-static.cabal
@@ -1,5 +1,5 @@
 Name:                wai-middleware-static
-Version:             0.3.2
+Version:             0.4.0
 Synopsis:            WAI middleware that intercepts requests to static files.
 Homepage:            https://github.com/ku-fpg/scotty
 Bug-reports:         https://github.com/ku-fpg/scotty/issues
@@ -21,15 +21,15 @@
 Library
   Exposed-modules:     Network.Wai.Middleware.Static
   default-language:    Haskell2010
-  Build-depends:       base             >= 4.3.1 && < 5,
-                       bytestring       >= 0.9.2.1,
-                       containers       >= 0.4,
-                       directory        >= 1.1,
-                       http-types       >= 0.6.8,
-                       mtl              >= 2.0.1,
-                       filepath         >= 1.3.0.0,
-                       text             >= 0.11.1,
-                       wai              >= 1.0.0
+  Build-depends:       base             >= 4.6.0.1  && < 5,
+                       bytestring       >= 0.10.0.2 && < 0.11,
+                       containers       >= 0.5.0.0  && < 0.6,
+                       directory        >= 1.2.0.1  && < 1.3,
+                       http-types       >= 0.8.2    && < 0.9,
+                       mtl              >= 2.1.2    && < 2.2,
+                       filepath         >= 1.3.0.1  && < 1.4,
+                       text             >= 0.11.3.1 && < 0.12,
+                       wai              >= 2.0.0    && < 2.1
 
   GHC-options: -Wall -fno-warn-orphans