diff --git a/Dockerfile b/Dockerfile
index f6d6128..69f7264 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,9 +1,7 @@
 FROM ruby:2.3.1
 
-RUN gem install danger
-
-RUN gem install danger-commit_lint
-
-RUN gem install danger-prose
+RUN gem install danger && \
+    gem install danger-commit_lint && \
+    gem install danger-prose
 
 ENTRYPOINT danger