diff --git a/.docker/ruby/Dockerfile b/.docker/ruby/Dockerfile
index 88cf8de1..c52be40e 100644
--- a/.docker/ruby/Dockerfile
+++ b/.docker/ruby/Dockerfile
@@ -14,7 +14,7 @@ RUN mkdir /app
 WORKDIR /app
 
 ADD Gemfile* /app/
-RUN bundle install
+RUN bundle install --jobs=$(nproc)
 COPY . /app
 
 COPY .docker/entrypoint.sh /usr/bin/