diff --git a/reform.cabal b/reform.cabal
--- a/reform.cabal
+++ b/reform.cabal
@@ -1,5 +1,5 @@
 Name:                reform
-Version:             0.1.1
+Version:             0.1.2
 Synopsis:            reform is an HTML form generation and validation library
 Description:          reform follows in the footsteps of formlets and
                       digestive-functors <= 0.2. It provides a
@@ -29,7 +29,7 @@
                        Text.Reform.Proof
                        Text.Reform.Result
   Build-depends:       base             >= 4 && <5,
-                       containers       == 0.4.*,
+                       containers       >= 0.4 && < 0.6,
                        mtl              >= 2.0 && < 2.2,
                        text             == 0.11.*