diff --git a/backend/Dockerfile b/backend/Dockerfile
index 58356e9..9d095e2 100644
--- a/backend/Dockerfile
+++ b/backend/Dockerfile
@@ -15,7 +15,8 @@ RUN mix local.hex --force && \
 ENV MIX_ENV=prod
 
 # install mix dependencies
-COPY mix.exs mix.lock ./
+COPY mix.exs ./
+COPY mix.lock ./
 COPY config config
 RUN mix deps.get
 RUN mix deps.compile