diff --git a/.build.yml b/.build.yml
index 5cc2a3d..eadc2a7 100644
--- a/.build.yml
+++ b/.build.yml
@@ -3,10 +3,13 @@ packages:
   - build-essential
   - git
   - elixir
+  - erlang
 sources:
   - git@git.broccoli.town:dp/wish
 tasks:
   - setup: |
       cd wish
+      mix local.hex --force
+      mix local.rebar --force
       mix deps.get
       mix test