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:        0.6.1
+Version:        0.6.1.1
 License:        GPL
 License-File:   LICENSE
 Author:         Henning Thielemann <haskell@henning-thielemann.de>
@@ -19,7 +19,7 @@
 Build-Type:     Simple
 
 Source-Repository this
-  Tag:         0.6.1
+  Tag:         0.6.1.1
   Type:        darcs
   Location:    http://code.haskell.org/synthesizer/midi/
 
@@ -48,7 +48,7 @@
     event-list >=0.1.2 && <0.2,
     data-accessor-transformers >=0.2.1 && <0.3,
     data-accessor >=0.2.1 && <0.3,
-    containers >=0.1 && <0.6,
+    containers >=0.1 && <0.7,
     array >=0.1 && <0.6,
     transformers >=0.2 && <0.6,
     semigroups >=0.1 && <1.0,