diff --git a/Dockerfile b/Dockerfile
index 8f90833..204a5f9 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -13,7 +13,8 @@ ENV TZ=America/Campo_Grande
 RUN ln -snf /usr/share/zoneinfo/$TZ /etc/localtime && echo $TZ > /etc/timezone
 
 WORKDIR /code
-COPY . /code
+ADD Gemfile /code
+ADD Gemfile.lock /code
 
 RUN bundle install