diff --git a/pkgs/development/libraries/haskell/graphviz/default.nix b/pkgs/development/libraries/haskell/graphviz/default.nix
index e48f92e5b818..637bb5ba45ac 100644
--- a/pkgs/development/libraries/haskell/graphviz/default.nix
+++ b/pkgs/development/libraries/haskell/graphviz/default.nix
@@ -4,12 +4,11 @@
 
 cabal.mkDerivation (self: {
   pname = "graphviz";
-  version = "2999.14.1.0";
-  sha256 = "13fni5sf6cdfvgyh7kqjjdhmjxkhbgl3gbi0cbq90n8blzg4q1ql";
+  version = "2999.15.0.1";
+  sha256 = "137d8n20fbpdz7az79gqharsfl293pl3xn444338i6blfi47ssdy";
   buildDepends = [
     colour dlist fgl filepath polyparse text transformers wlPprintText
   ];
-  patchPhase = "sed -i -e 's|bytestring.*,|bytestring,|' graphviz.cabal";
   meta = {
     homepage = "http://projects.haskell.org/graphviz/";
     description = "Bindings to Graphviz for graph visualisation";