diff --git a/graph-rewriting-layout.cabal b/graph-rewriting-layout.cabal
--- a/graph-rewriting-layout.cabal
+++ b/graph-rewriting-layout.cabal
@@ -1,5 +1,5 @@
 Name:          graph-rewriting-layout
-Version:       0.5.5
+Version:       0.5.6
 Copyright:     (c) 2010, Jan Rochel
 License:       BSD3
 License-File:  LICENSE
@@ -16,10 +16,10 @@
 
 Library
   Build-Depends:
-    base >= 4 && < 5,
-    base-unicode-symbols >= 0.2,
+    base >= 4.8 && < 4.10,
+    base-unicode-symbols >= 0.2 && < 0.3,
     graph-rewriting >= 0.7.8,
-    AC-Vector >= 2.3
+    AC-Vector >= 2.3 && < 2.4
   Exposed-Modules:
     GraphRewriting.Layout.Position
     GraphRewriting.Layout.PortSpec