diff --git a/dstring.cabal b/dstring.cabal
--- a/dstring.cabal
+++ b/dstring.cabal
@@ -1,5 +1,5 @@
 Name:               dstring
-Version:            0.4.0.3
+Version:            0.4.0.4
 Synopsis:           Difference strings
 Description:
   Difference strings: a data structure for O(1) append on strings. Note that a
@@ -25,7 +25,7 @@
   Location: git://github.com/basvandijk/dstring.git
 
 Library
-  Build-Depends: base                 >= 4     && < 4.6
+  Build-Depends: base                 >= 4     && < 4.7
                , base-unicode-symbols >= 0.1.1 && < 0.3
                , dlist                >= 0.5   && < 0.6
   Exposed-modules: Data.DString