diff --git a/Dockerfile b/Dockerfile
index b1cf060..ea81597 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -8,5 +8,6 @@ RUN apt-get --quiet install --yes vim-common
 # install FastLane
 COPY Gemfile.lock .
 COPY Gemfile .
+RUN gem update --system
 RUN gem install bundler
 RUN bundle install