diff --git a/ZipperAG.cabal b/ZipperAG.cabal
--- a/ZipperAG.cabal
+++ b/ZipperAG.cabal
@@ -1,6 +1,6 @@
 Name:		   ZipperAG
-Version:	   0.8
-Cabal-Version: >= 1.2
+Version:	   0.9
+Cabal-Version: >= 1.6
 License:	   BSD3
 Author:		   Pedro Martins <pedromartins4@gmail.com>
 Maintainer:    Pedro Martins <pedromartins4@gmail.com>
@@ -14,7 +14,7 @@
 license-file:  LICENSE
 
 Library
-  Build-Depends:	base >= 2 && <=4.7.0.1
+  Build-Depends:	base == 4.*, syz
   Exposed-modules:  Language.Grammars.ZipperAG,
                     Language.Grammars.ZipperAG.Examples.Algol68,
                     Language.Grammars.ZipperAG.Examples.BreadthFirst,