diff --git a/reform.cabal b/reform.cabal
--- a/reform.cabal
+++ b/reform.cabal
@@ -1,5 +1,5 @@
 Name:                reform
-Version:             0.2.7.2
+Version:             0.2.7.3
 Synopsis:            reform is a type-safe 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  && < 0.6,
+                       containers       >= 0.4  && < 0.7,
                        mtl              >= 2.0  && < 2.3,
                        semigroups       >= 0.16 && < 0.19,
                        text             >= 0.11 && < 1.3