diff --git a/pandoc.cabal b/pandoc.cabal
index 89be5a656..25ff17328 100644
--- a/pandoc.cabal
+++ b/pandoc.cabal
@@ -375,7 +375,7 @@ Test-Suite test-pandoc
                   directory >= 1 && < 1.3,
                   filepath >= 1.1 && < 1.4,
                   process >= 1 && < 1.2,
-                  Diff >= 0.2 && < 0.3,
+                  Diff >= 0.2 && < 0.4,
                   test-framework >= 0.3 && < 0.9,
                   test-framework-hunit >= 0.2 && < 0.4,
                   test-framework-quickcheck2 >= 0.2.9 && < 0.4,