diff --git a/olwrapper.cabal b/olwrapper.cabal
--- a/olwrapper.cabal
+++ b/olwrapper.cabal
@@ -1,5 +1,5 @@
 Name:           olwrapper
-Version:        0.3.7.8
+Version:        0.3.7.9
 Synopsis:       An OpenLayers JavaScript Wrapper and Webframework with snaplet-fay
 Description:    test
 Author:         Thomas Edelmann
@@ -34,6 +34,7 @@
     Site
   other-extensions:    
   build-depends:       
+    base                      >= 4 && < 4.8,
     lens                      == 4.4.0.2   ,
     fay-base                  == 0.19.4.1  ,
     fay-text                  == 0.3.2     ,