diff --git a/fixhs.cabal b/fixhs.cabal
--- a/fixhs.cabal
+++ b/fixhs.cabal
@@ -1,5 +1,5 @@
 name:                fixhs
-version:             0.1
+version:             0.1.1
 description:         Financial Information eXchange (FIX) protocol (co)parser
 homepage:            http://github.com/urv/fixhs
 synopsis:            FIX (co)parser
diff --git a/src/Data/Coparser.hs b/src/Data/Coparser.hs
--- a/src/Data/Coparser.hs
+++ b/src/Data/Coparser.hs
@@ -25,7 +25,6 @@
 import qualified Data.Text.Lazy.Builder as Builder 
     ( fromString, singleton, toLazyText )
 import Data.Monoid ( mappend, mconcat )
-import Control.DeepSeq ( NFData (..) )
 import qualified Data.DList as DL
 import Data.Bits.Utils ( w82c )
 
@@ -93,11 +92,6 @@
     append = mappend
     concat = mconcat
 
-instance NFData Builder where
-    rnf = rnf . Builder.unpack . Builder.toLazyText
-
-instance NFData (DL.DList Char) where
-    rnf = rnf . unpack
 
 class Coparser a where
     coparse :: BuilderLike t c => a -> t
diff --git a/src/Data/FIX/Message.hs b/src/Data/FIX/Message.hs
--- a/src/Data/FIX/Message.hs
+++ b/src/Data/FIX/Message.hs
@@ -29,7 +29,6 @@
 import Data.Attoparsec ( Parser ) 
 import Data.LookupTable ( LookupTable )
 import qualified Data.LookupTable as LT ( toList )
-import Control.DeepSeq ( NFData (..) )
 import Test.QuickCheck ( Gen )
 import Data.FIX.Common ( delimiter )
 import Data.Coparser ( BuilderLike (..), foldl' )
@@ -66,7 +65,7 @@
 
 --- should be alias of type in the typeclass LookupTable
 newtype ListOfValues a = LoV (IntMap a) 
-    deriving (LookupTable Int a, NFData)
+    deriving (LookupTable Int a)
 
 instance Show a => Show (ListOfValues a) where
     show a = concatMap printKV $ LT.toList a
@@ -117,26 +116,4 @@
                 where 
                     _sumUp :: (Enum c) => Int -> c -> Int
                     _sumUp t c = t + fromEnum c
-
-instance Control.DeepSeq.NFData ByteString 
-instance Control.DeepSeq.NFData CalendarTime
-instance Control.DeepSeq.NFData FIXGroupElement where
-    rnf (FIXGroupElement _ s vs) = rnf s `seq` rnf vs 
-
-instance Control.DeepSeq.NFData FIXValue where
-    rnf (FIXInt x) = rnf x
-    rnf (FIXDouble x) = rnf x
-    rnf (FIXChar x) = rnf x
-    rnf (FIXBool x) = rnf x
-    rnf (FIXString x) = rnf x
-    rnf (FIXMultipleValueString x) = rnf x
-    rnf (FIXTimestamp x) = rnf x
-    rnf (FIXTimeOnly x) = rnf x
-    rnf (FIXDateOnly x) = rnf x
-    rnf (FIXMonthYear x) = rnf x
-    rnf (FIXData x) = rnf x 
-    rnf (FIXGroup l es) = rnf l `seq` rnf es
-
-instance Control.DeepSeq.NFData (FIXMessage a) where
-    rnf (FIXMessage _ _ h b t) = rnf h `seq` rnf b `seq` rnf t