diff --git a/synthesizer-filter.cabal b/synthesizer-filter.cabal
--- a/synthesizer-filter.cabal
+++ b/synthesizer-filter.cabal
@@ -1,5 +1,5 @@
 Name:           synthesizer-filter
-Version:        0.4.1
+Version:        0.4.1.1
 License:        GPL
 License-File:   LICENSE
 Author:         Henning Thielemann <haskell@henning-thielemann.de>
@@ -17,7 +17,7 @@
 Build-Type:     Simple
 
 Source-Repository this
-  Tag:         0.4.1
+  Tag:         0.4.1.1
   Type:        darcs
   Location:    http://code.haskell.org/synthesizer/filter/
 
@@ -32,7 +32,7 @@
     numeric-prelude >=0.2 && <0.5,
     numeric-quest >= 0.1 && <0.3,
     utility-ht >=0.0.5 && <0.1,
-    containers >=0.1 && <0.6,
+    containers >=0.1 && <0.7,
     base >= 3 && <5
 
   GHC-Options:    -Wall