diff --git a/explicit-sharing.cabal b/explicit-sharing.cabal
--- a/explicit-sharing.cabal
+++ b/explicit-sharing.cabal
@@ -1,5 +1,5 @@
 Name:          explicit-sharing
-Version:       0.3.1
+Version:       0.3.1.1
 Cabal-Version: >= 1.6
 Synopsis:      Explicit Sharing of Monadic Effects
 Description:   
@@ -19,7 +19,7 @@
 Extra-Source-Files: Test.hs
 
 Library
-  Build-Depends:    base, containers, mtl
+  Build-Depends:    base, containers ==0.2.0.0, mtl
   Exposed-Modules:  Control.Monad.Sharing,
                     Control.Monad.Sharing.Lazy
   Ghc-Options:      -Wall