diff --git a/Dockerfile b/Dockerfile
index 10a36679bd0b72b9bfb52c2e6799677d5fe9f79c..38292aca28d13611d54f1832b631a56853d25b65 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -33,7 +33,6 @@ RUN cd /root/tmp && \
 ### Install ruby dependencies and update rdoc
 RUN cd /root/tmp && \
     gem install --force --local /root/tmp/dependencies/bundle-audit/*.gem --no-document --no-rdoc --no-ri && \
-    gem install rdoc && \
     gem cleanup