diff --git a/makefu/source.nix b/makefu/source.nix
index 40aeac8b6..d956a06cd 100644
--- a/makefu/source.nix
+++ b/makefu/source.nix
@@ -23,7 +23,7 @@ let
     ];
   };
   # TODO: automate updating of this ref + cherry-picks
-  ref = "a09afbfb8a4"; # nixos-18.03 @ 2018-04-04
+  ref = "a8e3e2cc1f7"; # nixos-18.03 @ 2018-05-31
                        # + do_sqlite3 ruby: 55a952be5b5
 
 in