diff --git a/WxGeneric.cabal b/WxGeneric.cabal
--- a/WxGeneric.cabal
+++ b/WxGeneric.cabal
@@ -1,5 +1,5 @@
 Name:           WxGeneric
-Version:        0.6.0
+Version:        0.6.1
 Copyright:      Mads Lindstrøm <mads_lindstroem@yahoo.dk>
 License:        LGPL
 License-file:   wxWidgetsLicense.txt
@@ -7,9 +7,15 @@
 Maintainer:     Mads Lindstrøm <mads_lindstroem@yahoo.dk>
 Homepage:	http://www.haskell.org/haskellwiki/WxGeneric
 Category:       GUI
-Build-Depends:  SybWidget>=0.5.2,base,haskell98,mtl,xtc>=1.0,wx>=0.10.3,containers>0.2
-               ,wxcore>=0.10.3
-Tested-with:    GHC==6.10.1,GHC==6.10.2
+Build-Depends:  SybWidget >= 0.5.2 && < 0.6.0,
+                base >=4.1.0 && < 4.3.0,
+                haskell98 >= 1.0.1 && < 1.1.0,
+                mtl >= 1.0.0 && < 1.2.0,
+                xtc >= 1.0 && < 1.1.0,
+                wx >= 0.12.0 && < 0.13.0,
+                containers >= 0.2.0 && < 0.4.0,
+                wxcore >= 0.12.0 && < 0.13.0
+Tested-with:    GHC==6.12.1,GHC==6.10.4
 Synopsis:       Generic (SYB3) construction of wxHaskell widgets
 Build-type:	Simple
 Stability:      experimental
diff --git a/src/Graphics/UI/WxGeneric/GenericWidget/Parameters.hs b/src/Graphics/UI/WxGeneric/GenericWidget/Parameters.hs
--- a/src/Graphics/UI/WxGeneric/GenericWidget/Parameters.hs
+++ b/src/Graphics/UI/WxGeneric/GenericWidget/Parameters.hs
@@ -1,4 +1,4 @@
-{-# LANGUAGE ExistentialQuantification, FlexibleContexts, ImpredicativeTypes, RankNTypes #-}
+{-# LANGUAGE ExistentialQuantification, FlexibleContexts, RankNTypes #-}
 {-# OPTIONS -Wall #-}
 
 {- | Parameters to functions creating 'GenWid'-s.