diff --git a/src/Yi/Region.hs b/src/Yi/Region.hs
--- a/src/Yi/Region.hs
+++ b/src/Yi/Region.hs
@@ -31,10 +31,6 @@
 import Data.Binary
 import GHC.Generics (Generic)
 
-#ifdef TESTING
-import Test.QuickCheck
-#endif
-
 -- | The region data type.
 -- The region is semi open: it includes the start but not the end bound.
 -- This allows simpler region-manipulation algorithms.
@@ -45,14 +41,6 @@
     } deriving (Typeable, Generic)
 
 instance Binary Region
-
-#ifdef TESTING
-instance Arbitrary Region where
-    arbitrary = sized $ \size -> do
-        x0 :: Int <- arbitrary
-        return $ mkRegion (fromIntegral x0) (fromIntegral (x0 + size))
-#endif
-
 
 instance Show Region where
     show r = show (regionStart r) ++
diff --git a/yi-language.cabal b/yi-language.cabal
--- a/yi-language.cabal
+++ b/yi-language.cabal
@@ -1,9 +1,9 @@
--- This file has been generated from package.yaml by hpack version 0.17.0.
+-- This file has been generated from package.yaml by hpack version 0.17.1.
 --
 -- see: https://github.com/sol/hpack
 
 name:           yi-language
-version:        0.14.1
+version:        0.15.0
 synopsis:       Collection of language-related Yi libraries.
 category:       Yi
 homepage:       https://github.com/yi-editor/yi#readme