diff --git a/Data/HBlock.hs b/Data/HBlock.hs
--- a/Data/HBlock.hs
+++ b/Data/HBlock.hs
@@ -1,4 +1,5 @@
-{-# LANGUAGE BangPatterns #-}
+{-# LANGUAGE BangPatterns       #-}
+{-# LANGUAGE DeriveDataTypeable #-} 
 module Data.HBlock where
 import Prelude hiding (foldr, foldl)
 import Data.Foldable (Foldable(..))
@@ -11,6 +12,7 @@
 import Data.SafeCopy
 import GHC.Exts (build)
 import qualified Data.List as L
+import Data.Data (Typeable)
 -- import Data.Indexation.IxData (IxData(IxData, ixDataPos, ixData))
 
 data HBlock a = HBlock { set      :: !IntSet
@@ -19,7 +21,7 @@
                        , numItems :: !Int
                        , blockLen :: !Int
                        , emptyVal :: !a
-                       } 
+                       } deriving (Typeable)
 
 instance Functor HBlock where
     fmap f (HBlock s v len num blen e) = 
diff --git a/hblock.cabal b/hblock.cabal
--- a/hblock.cabal
+++ b/hblock.cabal
@@ -2,7 +2,7 @@
 -- documentation, see http://haskell.org/cabal/users-guide/
 
 name:                hblock
-version:             0.1.0.1
+version:             0.1.0.2
 synopsis:            A mutable vector that provides indexation on the datatype fields it stores
 -- description:         
 license:             BSD3
@@ -28,12 +28,12 @@
                   , DeriveDataTypeable
                   , GeneralizedNewtypeDeriving
   ghc-options:   -Wall -O2
-  build-depends: base                   >=4.6  && <4.7
-               , vector                 >=0.10 && <0.11
-               , containers             >=0.5  && <0.6
-               , safecopy               >=0.8  && <0.9
-               , unordered-containers   >=0.2  && <0.3
-               , hashable               >=1.2  && <1.3
+  build-depends: base                   >=4 && < 5 
+               , vector                 >=0.10 
+               , containers             >=0.5  
+               , safecopy               >=0.8  
+               , unordered-containers   >=0.2  
+               , hashable               >=1.2  
                , uuid                   >=1.3.3
                , blaze-markup
                , path-pieces