diff --git a/Dockerfile b/Dockerfile
index 2c6b13a..82c6b0e 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -38,12 +38,14 @@ ENV MIX_ENV="prod"
 COPY mix.exs mix.lock ./
 RUN mix deps.get --only $MIX_ENV
 RUN mkdir config
+RUN mkdir rel
+RUN mix phx.gen.release
 
 # copy compile-time config files before we compile dependencies
 # to ensure any relevant config change will trigger the dependencies
 # to be re-compiled.
 COPY config/config.exs config/${MIX_ENV}.exs config/
-RUN mix deps.compile
+RUN mix deps.compile --only $MIX_ENV
 
 COPY priv priv