diff --git a/Network/Sendfile/Fallback.hs b/Network/Sendfile/Fallback.hs
--- a/Network/Sendfile/Fallback.hs
+++ b/Network/Sendfile/Fallback.hs
@@ -1,3 +1,4 @@
+{-# LANGUAGE CPP #-}
 module Network.Sendfile.Fallback (
     sendfile
   , sendfileWithHeader
@@ -26,6 +27,9 @@
 
 -- See sinkHandle.
 sinkSocket :: MonadIO m => Socket -> IO () -> Sink ByteString m ()
+#if MIN_VERSION_conduit(0,5,0)
+sinkSocket s hook = awaitForever $ \bs -> liftIO $ SB.sendAll s bs >> hook
+#else
 sinkSocket s hook = NeedInput push close
   where
     push bs = flip PipeM (return ()) $ do
@@ -33,6 +37,7 @@
         liftIO hook
         return (NeedInput push close)
     close = return ()
+#endif
 
 -- |
 -- Sendfile emulation using conduit.
diff --git a/simple-sendfile.cabal b/simple-sendfile.cabal
--- a/simple-sendfile.cabal
+++ b/simple-sendfile.cabal
@@ -1,5 +1,5 @@
 Name:                   simple-sendfile
-Version:                0.2.4
+Version:                0.2.5
 Author:                 Kazu Yamamoto <kazu@iij.ad.jp>
 Maintainer:             Kazu Yamamoto <kazu@iij.ad.jp>
 License:                BSD3
@@ -41,7 +41,7 @@
       else
         Other-Modules:  Network.Sendfile.Fallback
         Build-Depends:  bytestring      >= 0.9   && < 0.10
-                      , conduit         >= 0.4.1 && < 0.5
+                      , conduit         >= 0.4.1 && < 0.6
                       , transformers    >= 0.2.2 && < 0.4
 
 Test-Suite spec