diff --git a/checkers.cabal b/checkers.cabal
--- a/checkers.cabal
+++ b/checkers.cabal
@@ -1,6 +1,6 @@
 Name:                checkers
-Version:             0.5.5
-Cabal-Version:       >= 1.6
+Version:             0.5.6
+Cabal-Version:       >= 1.10
 Synopsis:            Check properties on standard classes and data structures.
 Category:            Testing
 Description:
@@ -51,3 +51,4 @@
   ghc-options:         -Wall
   if impl(ghc >= 8.0)
     ghc-options:       -Wredundant-constraints
+  Default-Language:    Haskell2010
diff --git a/src/Test/QuickCheck/Checkers.hs b/src/Test/QuickCheck/Checkers.hs
--- a/src/Test/QuickCheck/Checkers.hs
+++ b/src/Test/QuickCheck/Checkers.hs
@@ -50,11 +50,7 @@
 import qualified Control.Exception as Ex
 import Data.List (foldl')
 import Data.List.NonEmpty (NonEmpty (..))
-import Data.Monoid hiding (
-#if __GLASGOW_HASKELL__ < 810
-    First, Last
-#endif
-                          )
+import Data.Monoid hiding (First, Last)
 
 import Data.Complex
 import Data.Proxy