diff --git a/groups.cabal b/groups.cabal
--- a/groups.cabal
+++ b/groups.cabal
@@ -1,5 +1,5 @@
 name:                groups
-version:             0.1
+version:             0.1.0.1
 synopsis:            Haskell 98 groups
 description:         
   Haskell 98 groups. A group is a monoid with invertibility.
@@ -15,5 +15,5 @@
 library
   exposed-modules:     Data.Group
   -- other-modules:       
-  build-depends:       base ==4.5.*
+  build-depends:       base <5
   hs-source-dirs:      src