diff --git a/Dockerfile b/Dockerfile
index b80ef55..2681deb 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -7,11 +7,11 @@ WORKDIR /app
 COPY Gemfile Gemfile.lock ./
 RUN bundle install
 
-COPY bbs.rb ./
+COPY bbs.rb entrypoint.sh ./
 COPY lib/ ./lib/
 
-RUN mkdir -p /app/data
+RUN mkdir -p /app/data && chmod +x entrypoint.sh
 
 EXPOSE 2323
 
-CMD ["bundle", "exec", "ruby", "bbs.rb"]
+ENTRYPOINT ["./entrypoint.sh"]
diff --git a/entrypoint.sh b/entrypoint.sh
new file mode 100644
index 0000000..65410e4
--- /dev/null
+++ b/entrypoint.sh
@@ -0,0 +1,4 @@
+#!/bin/sh
+set -e
+bundle update bbs
+exec bundle exec ruby bbs.rb