diff --git a/observable-sharing.cabal b/observable-sharing.cabal
--- a/observable-sharing.cabal
+++ b/observable-sharing.cabal
@@ -2,7 +2,7 @@
 -- documentation, see http://haskell.org/cabal/users-guide/
 
 name:                observable-sharing
-version:             0.2.2.0
+version:             0.2.2.1
 synopsis:            Simple observable sharing
 -- description:         
 license:             BSD3
@@ -28,7 +28,7 @@
                        Data.Ref.Map
   -- other-modules:       
   -- other-extensions:    
-  build-depends:       base >=4 && <5,
+  build-depends:       base >=4.7 && <5,
                        containers
   hs-source-dirs:      .,src
   default-language:    Haskell2010