diff --git a/synthesizer-midi.cabal b/synthesizer-midi.cabal
--- a/synthesizer-midi.cabal
+++ b/synthesizer-midi.cabal
@@ -1,5 +1,5 @@
 Name:           synthesizer-midi
-Version:        0.6.0.1
+Version:        0.6.0.2
 License:        GPL
 License-File:   LICENSE
 Author:         Henning Thielemann <haskell@henning-thielemann.de>
@@ -19,7 +19,7 @@
 Build-Type:     Simple
 
 Source-Repository this
-  Tag:         0.6.0.1
+  Tag:         0.6.0.2
   Type:        darcs
   Location:    http://code.haskell.org/synthesizer/midi/
 
@@ -54,7 +54,7 @@
     data-accessor >=0.2.1 && <0.3,
     containers >=0.1 && <0.6,
     array >=0.1 && <0.6,
-    transformers >=0.2 && <0.4,
+    transformers >=0.2 && <0.5,
     utility-ht >=0.0.1 && <0.1
 
   If flag(splitBase)