diff --git a/cf.cabal b/cf.cabal
--- a/cf.cabal
+++ b/cf.cabal
@@ -1,5 +1,5 @@
 name:                cf
-version:             0.4
+version:             0.4.1
 synopsis:            Exact real arithmetic using continued fractions
 license:             MIT   
 license-file:        LICENSE
@@ -23,7 +23,7 @@
   exposed-modules: Math.ContinuedFraction,
                    Math.ContinuedFraction.Simple,
                    Math.ContinuedFraction.Interval
-  build-depends:       base >=4.7 && <4.8
+  build-depends:       base >= 4 && < 5
   default-language:    Haskell2010
 
 test-suite tests