diff --git a/opml-conduit.cabal b/opml-conduit.cabal
--- a/opml-conduit.cabal
+++ b/opml-conduit.cabal
@@ -1,5 +1,5 @@
 name:                opml-conduit
-version:             0.5.0.0
+version:             0.5.0.1
 synopsis:            Streaming parser/renderer for the OPML 2.0 format.
 description:
     This library implements the OPML 2.0 standard (<http://dev.opml.org/spec2.html>) as a 'conduit' parser/renderer.
diff --git a/test/Arbitrary.hs b/test/Arbitrary.hs
--- a/test/Arbitrary.hs
+++ b/test/Arbitrary.hs
@@ -1,3 +1,4 @@
+{-# LANGUAGE CPP                #-}
 {-# LANGUAGE DeriveGeneric      #-}
 {-# LANGUAGE FlexibleContexts   #-}
 {-# LANGUAGE FlexibleInstances  #-}
@@ -32,7 +33,10 @@
 import           URI.ByteString
 -- }}}
 
+#if MIN_VERSION_base(4,9,0)
+#else
 deriving instance Generic Version
+#endif
 
 -- | OPML version may only be @1.0@, @1.1@ or @2.0@
 instance Arbitrary Version where