diff --git a/rad.cabal b/rad.cabal
--- a/rad.cabal
+++ b/rad.cabal
@@ -1,5 +1,5 @@
 Name:                rad
-Version:             0.1.6
+Version:             0.1.6.1
 License:             BSD3
 License-File:        LICENSE
 Copyright:           Edward Kmett 2010
@@ -15,7 +15,7 @@
 Build-Type:          Simple
 Build-Depends:       base >= 4 && < 5,
                      data-reify >= 0.5 && < 0.7, 
-                     containers >= 0.2 && < 0.4,
+                     containers >= 0.2 && < 0.5,
                      array >= 0.2 && < 0.4
 Exposed-Modules:     Numeric.RAD
 Extra-Source-Files:  TODO