diff --git a/graph-rewriting-ski.cabal b/graph-rewriting-ski.cabal
--- a/graph-rewriting-ski.cabal
+++ b/graph-rewriting-ski.cabal
@@ -1,5 +1,5 @@
 Name:           graph-rewriting-ski
-Version:        0.6.1
+Version:        0.6.2
 Copyright:      (c) 2010, Jan Rochel
 License:        BSD3
 License-File:   LICENSE
@@ -43,7 +43,7 @@
     FlexibleContexts
     MultiParamTypeClasses
   Build-Depends:
-    base >= 4.3 && < 4.5,
+    base >= 4.3 && < 4.6,
     base-unicode-symbols >= 0.2 && < 0.3,
     graph-rewriting >= 0.7 && < 0.8,
     graph-rewriting-layout >= 0.5 && < 0.6,