diff --git a/monad-st.cabal b/monad-st.cabal
--- a/monad-st.cabal
+++ b/monad-st.cabal
@@ -1,6 +1,6 @@
 name:          monad-st
 category:      Control, Monads
-version:       0.2.0.2
+version:       0.2.1
 license:       BSD3
 cabal-version: >= 1.6
 license-file:  LICENSE
@@ -23,11 +23,11 @@
     FlexibleInstances
     UndecidableInstances
 
-  build-depends: 
-    base >= 4 && < 5,
-    transformers >= 0.2.0 && <= 0.3
+  build-depends:
+    base         >= 4   && < 5,
+    transformers >= 0.2 && < 0.4
 
   exposed-modules:
     Control.Monad.ST.Class
 
-  ghc-options:      -Wall 
+  ghc-options:      -Wall