--- darcs.cabal.orig	2017-07-11 16:28:16 UTC
+++ darcs.cabal
@@ -400,7 +400,7 @@ Library
                      transformers-compat >= 0.4 && < 0.6,
                      parsec       >= 3.1 && < 3.2,
                      fgl          >= 5.5.0.1 && < 5.6,
-                     graphviz     >= 2999.17.0.1 && < 2999.19,
+                     graphviz     >= 2999.17.0.1 && < 2999.20,
                      html         >= 1.0.1.2 && < 1.1,
                      filepath     >= 1.3.0.1 && < 1.5.0.0,
                      haskeline    >= 0.6.3 && < 0.8,