diff --git a/category.cabal b/category.cabal
--- a/category.cabal
+++ b/category.cabal
@@ -1,5 +1,5 @@
 name:                category
-version:             0.1.0.0
+version:             0.1.0.1
 synopsis:            Categorical types and classes
 -- description:         
 license:             BSD3
@@ -18,5 +18,6 @@
   build-depends:       base >=4.10 && <5
   default-language:    Haskell2010
   default-extensions:  LambdaCase
+                     , PolyKinds
                      , DeriveDataTypeable
   ghc-options:         -Wall