diff --git a/pkgs/applications/version-management/monotone-viz/mtn-head.nix b/pkgs/applications/version-management/monotone-viz/mtn-head.nix
index eb5228e09fdb..3674aa1e3dcc 100644
--- a/pkgs/applications/version-management/monotone-viz/mtn-head.nix
+++ b/pkgs/applications/version-management/monotone-viz/mtn-head.nix
@@ -3,9 +3,9 @@ rec {
   src = fetchmtn {
     name = "monotone-viz-mtn-checkout";
     dbs = ["monotone.ca"];
-    selector = "0e9194c89eb87e62ac7d54c7b88b10b94b07fa41";
-    branch = "net.venge.monotone-viz.automate";
-    sha256 = "d7980c9729b0a58f0dd27768b8eae46b45462fe72a88534b8aa159d889b4d624";
+    selector = "b34ff2e695b53c2d73d533a3ffa7cb081b48eefb";
+    branch = "net.venge.monotone-viz.new-stdio";
+    sha256 = "06263564bc111d865b50b4a9587a86f8d97fff47625a3c1cb98d90b79faf7889";
   } + "/";
 
   buildInputs = [ocaml lablgtk libgnomecanvas gtk graphviz glib