diff --git a/mmorph.cabal b/mmorph.cabal
--- a/mmorph.cabal
+++ b/mmorph.cabal
@@ -1,5 +1,5 @@
 Name: mmorph
-Version: 1.0.8
+Version: 1.0.9
 Cabal-Version: >= 1.8.0.2
 Build-Type: Simple
 License: BSD3
diff --git a/src/Control/Monad/Morph.hs b/src/Control/Monad/Morph.hs
--- a/src/Control/Monad/Morph.hs
+++ b/src/Control/Monad/Morph.hs
@@ -1,4 +1,4 @@
-{-# LANGUAGE CPP, RankNTypes, PolyKinds #-}
+{-# LANGUAGE CPP, RankNTypes #-}
 
 {-| A monad morphism is a natural transformation: