diff --git a/enummapset-th.cabal b/enummapset-th.cabal
--- a/enummapset-th.cabal
+++ b/enummapset-th.cabal
@@ -1,5 +1,5 @@
 name:           enummapset-th
-version:        0.6.0.2
+version:        0.6.1.0
 synopsis:       TH-generated EnumSet/EnumMap wrappers around IntSet/IntMap.
 description:
   This package wraps @IntSet@ and @IntMap@ from @containers@, and provides
@@ -23,6 +23,7 @@
 category:       Data
 build-type:     Simple
 cabal-version:  >= 1.8
+tested-with:    GHC == 7.8.3, GHC == 7.8.4, GHC == 7.10.2
 extra-source-files:
     include/map.inc
 
@@ -40,7 +41,7 @@
     build-depends:
         base >= 4.5 && < 5,
         deepseq >= 1.3,
-        containers >= 0.5 && < 0.6,
+        containers >= 0.5.3 && < 0.6,
         template-haskell >= 2.7
     include-dirs: include
     ghc-options: -Wall
diff --git a/include/map.inc b/include/map.inc
--- a/include/map.inc
+++ b/include/map.inc
@@ -100,6 +100,7 @@
 w 'foldl
 w 'foldrWithKey
 w 'foldlWithKey
+w 'foldMapWithKey
 
 -- * Traversal: Strict folds
 w 'foldr'