diff --git a/Data/Key.hs b/Data/Key.hs
--- a/Data/Key.hs
+++ b/Data/Key.hs
@@ -83,7 +83,7 @@
 import Data.List.NonEmpty (NonEmpty(..))
 import qualified Data.List.NonEmpty as NonEmpty
 import Data.Maybe (listToMaybe)
-import Data.Monoid as Monoid hiding (Product)
+import qualified Data.Monoid as Monoid
 import Data.Semigroup hiding (Product)
 import Data.Semigroup.Foldable
 import Data.Semigroup.Traversable
diff --git a/keys.cabal b/keys.cabal
--- a/keys.cabal
+++ b/keys.cabal
@@ -1,6 +1,6 @@
 name:          keys
 category:      Data Structures, Containers
-version:       2.1
+version:       2.1.1
 license:       BSD3
 cabal-version: >= 1.6
 license-file:  LICENSE
@@ -19,15 +19,15 @@
 
 library
   build-depends: 
-    array >= 0.3.0.2 && < 0.4,
-    base >= 4 && < 5,
-    containers >= 0.3 && < 0.5,
-    transformers >= 0.2.0 && < 0.3,
-    semigroups >= 0.7.1 && < 0.8,
-    semigroupoids >= 1.2.5 && < 1.3,
-    comonad-transformers >= 2.0 && < 2.1,
-    comonads-fd >= 2.0 && < 2.1,
-    free >= 2.0 && < 2.1
+    array                >= 0.3.0.2 && < 0.4,
+    base                 >= 4       && < 5,
+    containers           >= 0.3     && < 0.5,
+    transformers         >= 0.2.0   && < 0.3,
+    semigroups           >= 0.8     && < 0.9,
+    semigroupoids        >= 1.2.5   && < 1.3,
+    comonad-transformers >= 2.0.2   && < 2.1,
+    comonads-fd          >= 2.0.2   && < 2.1,
+    free                 >= 2.0.2   && < 2.1
 
   exposed-modules:
     Data.Key