diff --git a/Dockerfile b/Dockerfile
index 50115c7..3803cfc 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -2,7 +2,7 @@ FROM ubuntu:14.04
 MAINTAINER Education Team at Docker <education@docker.com>
 
 RUN apt-get update && apt-get install --no-install-recommends -y curl wget git ruby ruby-dev
-RUN gem install --no-ri --no-rdoc bundler sinatra faker i18n tilt rack rack-protection sinatra-reloader
+RUN gem install --no-ri --no-rdoc bundler sinatra faker i18n tilt rack-protection sinatra-reloader
 EXPOSE 9292
 WORKDIR /opt/namer
 CMD ["rackup", "--host", "0.0.0.0"]