diff --git a/data-accessor-transformers.cabal b/data-accessor-transformers.cabal
--- a/data-accessor-transformers.cabal
+++ b/data-accessor-transformers.cabal
@@ -1,5 +1,5 @@
 Name:             data-accessor-transformers
-Version:          0.2.1.4
+Version:          0.2.1.5
 License:          BSD3
 License-File:     LICENSE
 Author:           Henning Thielemann <haskell@henning-thielemann.de>
@@ -20,7 +20,7 @@
 Library
   Build-Depends:
     data-accessor >=0.2 && <0.4,
-    transformers >=0.2 && <0.4,
+    transformers >=0.2 && <0.5,
     base >=1.0 && <5
   Hs-Source-Dirs:   src
   GHC-Options:      -Wall