diff --git a/0.2/Control/Applicative/Backwards.hs b/0.2/Control/Applicative/Backwards.hs
--- a/0.2/Control/Applicative/Backwards.hs
+++ b/0.2/Control/Applicative/Backwards.hs
@@ -4,7 +4,7 @@
 # if __GLASGOW_HASKELL__ >= 702
 {-# LANGUAGE Safe #-}
 # endif
-# if __GLASGOW_HASKELL__ >= 704
+# if __GLASGOW_HASKELL__ >= 706
 {-# LANGUAGE PolyKinds #-}
 # endif
 #endif
diff --git a/0.2/Data/Functor/Reverse.hs b/0.2/Data/Functor/Reverse.hs
--- a/0.2/Data/Functor/Reverse.hs
+++ b/0.2/Data/Functor/Reverse.hs
@@ -4,7 +4,7 @@
 # if __GLASGOW_HASKELL__ >= 702
 {-# LANGUAGE Safe #-}
 # endif
-# if __GLASGOW_HASKELL__ >= 704
+# if __GLASGOW_HASKELL__ >= 706
 {-# LANGUAGE PolyKinds #-}
 # endif
 #endif
diff --git a/0.3/Control/Monad/Signatures.hs b/0.3/Control/Monad/Signatures.hs
--- a/0.3/Control/Monad/Signatures.hs
+++ b/0.3/Control/Monad/Signatures.hs
@@ -4,7 +4,7 @@
 # if __GLASGOW_HASKELL__ >= 702
 {-# LANGUAGE Safe #-}
 # endif
-# if __GLASGOW_HASKELL__ >= 704
+# if __GLASGOW_HASKELL__ >= 706
 {-# LANGUAGE PolyKinds #-}
 # endif
 #endif
diff --git a/0.3/Data/Functor/Sum.hs b/0.3/Data/Functor/Sum.hs
--- a/0.3/Data/Functor/Sum.hs
+++ b/0.3/Data/Functor/Sum.hs
@@ -9,7 +9,7 @@
 {-# LANGUAGE TypeFamilies #-}
 {-# LANGUAGE TypeOperators #-}
 # endif
-# if __GLASGOW_HASKELL__ >= 704
+# if __GLASGOW_HASKELL__ >= 706
 {-# LANGUAGE PolyKinds #-}
 # endif
 # if __GLASGOW_HASKELL__ >= 708
diff --git a/src/Control/Monad/Trans/Instances.hs b/src/Control/Monad/Trans/Instances.hs
--- a/src/Control/Monad/Trans/Instances.hs
+++ b/src/Control/Monad/Trans/Instances.hs
@@ -14,7 +14,7 @@
 {-# LANGUAGE Trustworthy #-}
 # endif
 
-# if __GLASGOW_HASKELL__ >= 704
+# if __GLASGOW_HASKELL__ >= 706
 {-# LANGUAGE PolyKinds #-}
 # endif
 
diff --git a/transformers-compat.cabal b/transformers-compat.cabal
--- a/transformers-compat.cabal
+++ b/transformers-compat.cabal
@@ -1,6 +1,6 @@
 name:          transformers-compat
 category:      Compatibility
-version:       0.5.0.4
+version:       0.5.1.2
 license:       BSD3
 cabal-version: >= 1.8
 license-file:  LICENSE
@@ -23,7 +23,7 @@
   Note: missing methods are not supplied, but this at least permits the types to be used.
 
 build-type:    Simple
-tested-with:   GHC == 7.0.4, GHC == 7.4.1, GHC == 7.4.2, GHC == 7.6.1, GHC == 7.8.2
+tested-with:   GHC == 7.0.4, GHC == 7.4.1, GHC == 7.4.2, GHC == 7.6.1, GHC == 7.8.2, GHC == 7.10.3, GHC == 8.0.1
 extra-source-files:
   .travis.yml
   .ghci
@@ -39,7 +39,7 @@
   location: git://github.com/ekmett/transformers-compat.git
 
 flag two
-  default: False
+  default: True
   description: Use transformers 0.2. This will be selected by cabal picking the appropriate version.
   manual: True