diff --git a/Data/IORef/Strict.hs b/Data/IORef/Strict.hs
--- a/Data/IORef/Strict.hs
+++ b/Data/IORef/Strict.hs
@@ -24,12 +24,11 @@
   )
 where
 
-import qualified System.IO.Strict.Internals as SIO
 import System.IO.Strict.Internals (SIO(..))
 import System.Mem.Weak (Weak)
 import qualified Data.IORef as IO
 import Data.IORef (IORef)
-import Control.Parallel.Strategies (NFData(..))
+import Control.DeepSeq (NFData(..))
 
 -- | Build a new 'IORef', but force the value before storing it.
 newIORef :: NFData sa => sa -> SIO (IORef sa)
diff --git a/LICENSE b/LICENSE
--- a/LICENSE
+++ b/LICENSE
@@ -1,28 +1,30 @@
+Copyright (c) 2009, Nicolas Pouillard
 All rights reserved.
 
 Redistribution and use in source and binary forms, with or without
-modification, are permitted provided that the following conditions
-are met:
+modification, are permitted provided that the following conditions are
+met:
 
-1. Redistributions of source code must retain the above copyright
-   notice, this list of conditions and the following disclaimer.
+    * Redistributions of source code must retain the above copyright
+      notice, this list of conditions and the following disclaimer.
 
-2. Redistributions in binary form must reproduce the above copyright
-   notice, this list of conditions and the following disclaimer in the
-   documentation and/or other materials provided with the distribution.
+    * Redistributions in binary form must reproduce the above
+      copyright notice, this list of conditions and the following
+      disclaimer in the documentation and/or other materials provided
+      with the distribution.
 
-3. Neither the name of the author nor the names of his contributors
-   may be used to endorse or promote products derived from this software
-   without specific prior written permission.
+    * Neither the name of the copyright holders nor the names of other
+      contributors may be used to endorse or promote products derived
+      from this software without specific prior written permission.
 
-THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``AS IS'' AND ANY EXPRESS OR
-IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
-WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
-DISCLAIMED.  IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE FOR
-ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
-DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
-OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
-HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
-STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
-ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
-POSSIBILITY OF SUCH DAMAGE.
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
diff --git a/System/IO/Strict.hs b/System/IO/Strict.hs
--- a/System/IO/Strict.hs
+++ b/System/IO/Strict.hs
@@ -107,11 +107,11 @@
 )
 where
 
-import Prelude (Bool, Int, Integer, String, Char, FilePath, Read, Show, (.), seq)
-import Control.Parallel.Strategies (NFData(..))
+import Prelude (Bool, Int, Integer, String, Char, FilePath, Read, Show, (.))
+import Control.DeepSeq (NFData(..))
 import System.IO (IOMode, Handle, BufferMode, HandlePosn, SeekMode)
 import GHC.Ptr (Ptr)
-import System.IO.Strict.Internals
+import System.IO.Strict.Internals (SIO, wrap0, wrap0', wrap1, wrap1', wrap2, wrap3, run, return')
 import qualified System.IO.Strict.Internals as SIO
 import qualified System.IO as IO
 
diff --git a/System/IO/Strict/Internals.hs b/System/IO/Strict/Internals.hs
--- a/System/IO/Strict/Internals.hs
+++ b/System/IO/Strict/Internals.hs
@@ -38,13 +38,12 @@
 where
 
 import Prelude ((.), seq)
-import Control.Parallel.Strategies (NFData(..))
+import Control.DeepSeq (NFData(..))
 import Control.Monad
 import Control.Monad.Fix
 -- import Control.Monad.Error
 import Control.Applicative
 import System.IO (IO)
-import qualified System.IO as IO
 
 newtype SIO a = SIO { rawRun :: IO a }
   deriving (Functor, Applicative, Monad, MonadFix {-, MonadPlus, MonadError IOError-}) -- Not MonadIO !!!!
diff --git a/strict-io.cabal b/strict-io.cabal
--- a/strict-io.cabal
+++ b/strict-io.cabal
@@ -1,6 +1,6 @@
 name:            strict-io
 cabal-Version:   >=1.6
-version:         0.1
+version:         0.1.1
 license:         BSD3
 license-File:    LICENSE
 copyright:       (c) Nicolas Pouillard
@@ -9,12 +9,12 @@
 category:        System
 synopsis:        A library wrapping standard IO modules to provide strict IO.
 description:     This library is a thin layer on top standard IO modules like System.IO
-                 that re-expose these functions under a different type, namely SIO.
+                 and Data.IORef that re-expose these functions under a different type, namely SIO.
 stability:       Provisional
 build-type:      Simple
 
 library
-  build-depends:   base>=3.0, parallel, extensible-exceptions
+  build-depends:   base>=3.0 && <5, deepseq==1.1.*, extensible-exceptions
   exposed-modules: System.IO.Strict
                    System.IO.Strict.Internals
                    Data.IORef.Strict