diff --git a/datetime.cabal b/datetime.cabal
--- a/datetime.cabal
+++ b/datetime.cabal
@@ -1,5 +1,5 @@
 name:                datetime
-version:             0.1
+version:             0.2
 stability:           experimental
 Description:
   Provides several utilities for easily converting among the
@@ -16,8 +16,8 @@
 build-type:          Simple
 
 library
-  build-depends:     base,
-                     QuickCheck >= 1.2,
+  build-depends:     base >= 2 && < 4,
+                     QuickCheck >= 2 && < 3,
                      old-locale >= 1.0.0.1,
                      old-time >= 1.0.0.1,
                      time >= 1.1.2.2
diff --git a/src/Data/DateTime.lhs b/src/Data/DateTime.lhs
--- a/src/Data/DateTime.lhs
+++ b/src/Data/DateTime.lhs
@@ -25,7 +25,6 @@
 >     arbitrary       = do
 >         offset <- choose (0, 20000) :: Gen Float
 >         return . fromMJD' $ offset + fromRational startOfTimeMJD
->     coarbitrary _ b = b
 
 So that we can use our DateTime class with HDBC.