# Install RVM
RUN apt-get update && \
apt-get -y install --no-install-recommends curl ca-certificates && \
- gpg --keyserver pool.sks-keyservers.net --recv-keys D39DC0E3 && \
+ gpg --keyserver ha.pool.sks-keyservers.net --recv-keys D39DC0E3 && \
curl -L https://get.rvm.io | bash -s stable && \
/usr/local/rvm/bin/rvm install 2.3 && \
/usr/local/rvm/bin/rvm alias create default ruby-2.3