diff --git a/Graphalyze.cabal b/Graphalyze.cabal
--- a/Graphalyze.cabal
+++ b/Graphalyze.cabal
@@ -1,5 +1,5 @@
 Name:                Graphalyze
-Version:             0.13.0.0
+Version:             0.13.0.1
 Synopsis:            Graph-Theoretic Analysis library.
 Description:         A library to use graph theory to analyse the relationships
                         inherent in discrete data.
@@ -30,7 +30,7 @@
                          time,
                          bktrees >= 0.2 && <0.4,
                          fgl >= 5.4.2.3 && < 5.5,
-                         graphviz == 2999.13.*,
+                         graphviz >= 2999.13 && < 2999.15,
                          pandoc >= 1.8 && < 1.10,
                          text