diff --git a/ranges.cabal b/ranges.cabal
--- a/ranges.cabal
+++ b/ranges.cabal
@@ -1,5 +1,5 @@
 Name: ranges
-Version: 0.2.3
+Version: 0.2.4
 Description: Ranges and some functions allowing things like fast membership
 	lookup on ranges with holes in them and so on.
 Synopsis: Ranges and various functions on them.
@@ -12,6 +12,6 @@
 Category: data
 
 Library
- Build-Depends: base>=2 && <4.4, containers>=0.2
+ Build-Depends: base>=2 && <5, containers>=0.2
  Exposed-modules: Data.Ranges
  ghc-options: -O2 -Wall