diff --git a/crypto-conduit.cabal b/crypto-conduit.cabal
--- a/crypto-conduit.cabal
+++ b/crypto-conduit.cabal
@@ -1,6 +1,6 @@
 Cabal-version:       >= 1.8
 Name:                crypto-conduit
-Version:             0.4.0
+Version:             0.4.0.1
 Synopsis:            Conduit interface for cryptographic operations (from crypto-api).
 Homepage:            https://github.com/meteficha/crypto-conduit
 License:             BSD3
@@ -33,7 +33,7 @@
     Crypto.Conduit
   Build-depends:
     base         >= 3   && < 5,
-    bytestring   >= 0.9 && < 0.10,
+    bytestring   >= 0.9,
     cereal       >= 0.3 && < 0.4,
     conduit      >= 0.5 && < 0.6,
     transformers >= 0.2 && < 0.4
diff --git a/src/Crypto/Conduit.hs b/src/Crypto/Conduit.hs
--- a/src/Crypto/Conduit.hs
+++ b/src/Crypto/Conduit.hs
@@ -1,4 +1,4 @@
-{-# LANGUAGE BangPatterns, CPP #-}
+{-# LANGUAGE BangPatterns, CPP, RankNTypes #-}
 -- | This module contains wrappers for cryptographic functions
 -- using the @conduit@ package.  Currently there is support for
 -- hashes, HMACs and many modes of block ciphers (but not