diff --git a/CHANGES b/CHANGES
--- a/CHANGES
+++ b/CHANGES
@@ -1,3 +1,7 @@
+* 0.3.2.1: 25 September 2013
+
+  - allow groups-0.4
+
 * 0.3.2: 30 August 2013
 
   - new Group instance for Endomorphism
diff --git a/monoid-extras.cabal b/monoid-extras.cabal
--- a/monoid-extras.cabal
+++ b/monoid-extras.cabal
@@ -1,5 +1,5 @@
 name:                monoid-extras
-version:             0.3.2.0
+version:             0.3.2.1
 synopsis:            Various extra monoid-related definitions and utilities
 description:         Various extra monoid-related definitions and utilities,
                      such as monoid actions, monoid coproducts, \"deletable\"
@@ -32,7 +32,7 @@
                      Data.Monoid.WithSemigroup
 
   build-depends:     base >= 4.3 && < 4.8,
-                     groups < 0.4,
+                     groups < 0.5,
                      groupoids < 4,
                      semigroups >= 0.8 && < 0.10,
                      semigroupoids < 4