diff --git a/Dockerfile b/Dockerfile
index 32eb2b0..77874bf 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -10,5 +10,6 @@ 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
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