diff --git a/Data/Key.hs b/Data/Key.hs
--- a/Data/Key.hs
+++ b/Data/Key.hs
@@ -67,8 +67,8 @@
 
 import Control.Applicative
 import Control.Comonad.Trans.Traced
-import Control.Monad.Trans.Free
-import Control.Comonad.Trans.Cofree
+import Control.Monad.Free
+import Control.Comonad.Cofree
 import Control.Monad.Trans.Identity
 import Control.Monad.Trans.Reader
 import qualified Data.Array as Array
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:       0.3.0
+version:       1.8.0
 license:       BSD3
 cabal-version: >= 1.6
 license-file:  LICENSE
@@ -21,12 +21,13 @@
   build-depends: 
     array >= 0.3.0.2 && < 0.4,
     base >= 4 && < 4.4,
-    comonad-transformers >= 1.7 && < 1.8,
-    comonads-fd >= 1.7 && < 1.8,
     containers >= 0.3 && < 0.5,
     semigroups >= 0.5 && < 0.6,
     semigroupoids >= 1.2.2 && < 1.3,
-    transformers >= 0.2.0 && < 0.3
+    transformers >= 0.2.0 && < 0.3,
+    comonad-transformers >= 1.8 && < 1.9,
+    comonads-fd >= 1.8 && < 1.9,
+    free >= 1.8 && < 1.9
 
   exposed-modules:
     Data.Key