diff --git a/Color/src/Graphics/Color/Adaptation/Internal.hs b/Color/src/Graphics/Color/Adaptation/Internal.hs
index 7661c21..ccdb3d5 100644
--- a/Color/src/Graphics/Color/Adaptation/Internal.hs
+++ b/Color/src/Graphics/Color/Adaptation/Internal.hs
@@ -4,6 +4,7 @@
 {-# LANGUAGE PolyKinds #-}
 {-# LANGUAGE ScopedTypeVariables #-}
 {-# LANGUAGE TypeFamilies #-}
+{-# LANGUAGE TypeOperators #-}
 -- |
 -- Module      : Graphics.Color.Adaptation.Internal
 -- Copyright   : (c) Alexey Kuleshevich 2019-2020
diff --git a/Color/src/Graphics/Color/Adaptation/VonKries.hs b/Color/src/Graphics/Color/Adaptation/VonKries.hs
index 5b8956b..49c88a7 100644
--- a/Color/src/Graphics/Color/Adaptation/VonKries.hs
+++ b/Color/src/Graphics/Color/Adaptation/VonKries.hs
@@ -1,3 +1,4 @@
+{-# LANGUAGE CPP #-}
 {-# LANGUAGE FlexibleContexts #-}
 {-# LANGUAGE FlexibleInstances #-}
 {-# LANGUAGE MultiParamTypeClasses #-}
@@ -5,7 +6,12 @@
 {-# LANGUAGE ScopedTypeVariables #-}
 {-# LANGUAGE TypeApplications #-}
 {-# LANGUAGE TypeFamilies #-}
+#if __GLASGOW_HASKELL__ >= 906
+{-# LANGUAGE DataKinds #-}
+{-# LANGUAGE PolyKinds #-}
+#else
 {-# LANGUAGE TypeInType #-}
+#endif
 -- |
 -- Module      : Graphics.Color.Adaptation.VonKries
 -- Copyright   : (c) Alexey Kuleshevich 2018-2020
diff --git a/Color/src/Graphics/Color/Model/Internal.hs b/Color/src/Graphics/Color/Model/Internal.hs
index 4546149..9031c4f 100644
--- a/Color/src/Graphics/Color/Model/Internal.hs
+++ b/Color/src/Graphics/Color/Model/Internal.hs
@@ -4,6 +4,7 @@
 {-# LANGUAGE MultiParamTypeClasses #-}
 {-# LANGUAGE ScopedTypeVariables #-}
 {-# LANGUAGE TypeFamilies #-}
+{-# LANGUAGE TypeOperators #-}
 {-# LANGUAGE UndecidableInstances #-}
 -- |
 -- Module      : Graphics.Color.Model.Internal
@@ -43,7 +44,7 @@ module Graphics.Color.Model.Internal
   , VU.Vector(V_Color)
   ) where
 
-import Control.Applicative
+import qualified Control.Applicative as A
 import Control.DeepSeq (NFData(rnf), deepseq)
 import Data.Default.Class (Default(..))
 import Data.Foldable
@@ -94,11 +95,11 @@ instance ColorModel cs e => Default (Color cs e) where
 
 
 instance ColorModel cs e => Num (Color cs e) where
-  (+)         = liftA2 (+)
+  (+)         = A.liftA2 (+)
   {-# INLINE (+) #-}
-  (-)         = liftA2 (-)
+  (-)         = A.liftA2 (-)
   {-# INLINE (-) #-}
-  (*)         = liftA2 (*)
+  (*)         = A.liftA2 (*)
   {-# INLINE (*) #-}
   abs         = fmap abs
   {-# INLINE abs #-}
@@ -109,7 +110,7 @@ instance ColorModel cs e => Num (Color cs e) where
 
 
 instance (ColorModel cs e, Fractional e) => Fractional (Color cs e) where
-  (/)          = liftA2 (/)
+  (/)          = A.liftA2 (/)
   {-# INLINE (/) #-}
   recip        = fmap recip
   {-# INLINE recip #-}
diff --git a/Color/src/Graphics/Color/Space/DIN99.hs b/Color/src/Graphics/Color/Space/DIN99.hs
index 9a368ab..2c32d4d 100644
--- a/Color/src/Graphics/Color/Space/DIN99.hs
+++ b/Color/src/Graphics/Color/Space/DIN99.hs
@@ -25,7 +25,6 @@ import GHC.Generics (Generic)
 import Graphics.Color.Model.Internal
 import Graphics.Color.Space.Internal
 import Graphics.Color.Space.CIE1976.LAB
-import Graphics.Color.Illuminant.Wikipedia as W
 
 data DIN99 (i :: k)
 
diff --git a/Color/src/Graphics/Color/Space/Internal.hs b/Color/src/Graphics/Color/Space/Internal.hs
index d311678..16be2a6 100644
--- a/Color/src/Graphics/Color/Space/Internal.hs
+++ b/Color/src/Graphics/Color/Space/Internal.hs
@@ -11,6 +11,7 @@
 {-# LANGUAGE ScopedTypeVariables #-}
 {-# LANGUAGE StandaloneDeriving #-}
 {-# LANGUAGE TypeFamilies #-}
+{-# LANGUAGE TypeOperators #-}
 {-# LANGUAGE UndecidableInstances #-}
 {-# LANGUAGE ViewPatterns #-}
 -- |
diff --git a/Color/src/Graphics/Color/Standard/RAL.hs b/Color/src/Graphics/Color/Standard/RAL.hs
index 2a70b46..d0d6503 100644
--- a/Color/src/Graphics/Color/Standard/RAL.hs
+++ b/Color/src/Graphics/Color/Standard/RAL.hs
@@ -1,10 +1,16 @@
+{-# LANGUAGE CPP #-}
 {-# LANGUAGE FlexibleContexts #-}
 {-# LANGUAGE FlexibleInstances #-}
 {-# LANGUAGE MultiParamTypeClasses #-}
 {-# LANGUAGE NegativeLiterals #-}
 {-# LANGUAGE ScopedTypeVariables #-}
 {-# LANGUAGE TypeFamilies #-}
+#if __GLASGOW_HASKELL__ >= 906
+{-# LANGUAGE DataKinds #-}
+{-# LANGUAGE PolyKinds #-}
+#else
 {-# LANGUAGE TypeInType #-}
+#endif
 -- |
 -- Module      : Graphics.Color.Standard.RAL
 -- Copyright   : (c) Alexey Kuleshevich 2019-2020
diff --git a/Color/src/Graphics/Pixel/ColorSpace.hs b/Color/src/Graphics/Pixel/ColorSpace.hs
index 9293f2f..868d4ea 100644
--- a/Color/src/Graphics/Pixel/ColorSpace.hs
+++ b/Color/src/Graphics/Pixel/ColorSpace.hs
@@ -4,6 +4,7 @@
 {-# LANGUAGE PatternSynonyms #-}
 {-# LANGUAGE PolyKinds #-}
 {-# LANGUAGE TypeFamilies #-}
+{-# LANGUAGE TypeOperators #-}
 {-# LANGUAGE UndecidableInstances #-}
 {-# LANGUAGE ViewPatterns #-}
 -- |
diff --git a/stack.yaml b/stack.yaml
index 92d2603..832f1d5 100644
--- a/stack.yaml
+++ b/stack.yaml
@@ -1,4 +1,4 @@
-resolver: lts-18.28
+resolver: lts-23.00
 packages:
 - Color
 extra-deps: []