diff --git a/makefu/source.nix b/makefu/source.nix
index e1714161f..fdd367cba 100644
--- a/makefu/source.nix
+++ b/makefu/source.nix
@@ -11,9 +11,10 @@ let
               then "buildbot"
               else "makefu";
   _file = <stockholm> + "/makefu/1systems/${name}/source.nix";
-  ref = "2c566ee"; # unstable @ 2017-09-04
+  ref = "c91346e"; # unstable @ 2017-09-04
                    # + graceful requests2 (a772c3aa)
                    # + mitmproxy fix      (eee2d174)
+                   # + tpm-tools fix      (5cb9987)
 
 in
   evalSource (toString _file) [