diff --git a/synthesizer-alsa.cabal b/synthesizer-alsa.cabal
--- a/synthesizer-alsa.cabal
+++ b/synthesizer-alsa.cabal
@@ -1,5 +1,5 @@
 Name:           synthesizer-alsa
-Version:        0.5.0.1
+Version:        0.5.0.2
 License:        GPL
 License-File:   LICENSE
 Author:         Henning Thielemann <haskell@henning-thielemann.de>
@@ -19,7 +19,7 @@
 Build-Type:     Simple
 
 Source-Repository this
-  Tag:         0.5.0.1
+  Tag:         0.5.0.2
   Type:        darcs
   Location:    http://code.haskell.org/synthesizer/alsa/
 
@@ -53,7 +53,7 @@
     numeric-prelude >=0.3 && <0.5,
     non-negative >=0.1 && <0.2,
     event-list >=0.1 && <0.2,
-    transformers >=0.2 && <0.4,
+    transformers >=0.2 && <0.5,
     utility-ht >=0.0.1 && <0.1
 
   If flag(splitBase)