like this

mix.exs

@@ -172,7 +172,7 @@ defmodule Pleroma.Mixfile do
        git: "https://git.pleroma.social/pleroma/elixir-libraries/elixir-captcha.git",
        ref: "e0f16822d578866e186a0974d65ad58cddc1e2ab"},
       {:mox, "~> 0.5", only: :test},
-      {:restarter, path: "../restarter"}
+      {:restarter, in_umbrella: true}
     ] ++ oauth_deps()
   end