diff --git a/pkgs/applications/science/biology/poretools/default.nix b/pkgs/applications/science/biology/poretools/default.nix
index 520c508e2ac..3bb9ea06fd4 100755
--- a/pkgs/applications/science/biology/poretools/default.nix
+++ b/pkgs/applications/science/biology/poretools/default.nix
@@ -2,7 +2,7 @@
 
 pythonPackages.buildPythonPackage rec {
   pname = "poretools";
-  version = "0.6.0";
+  version = "unstable-2016-07-10";
   name = "${pname}-${version}";
 
   src = fetchFromGitHub {