language: ruby rvm: - 2.3 - 2.4 - 2.5 - 2.6 - ruby-head matrix: include: - rvm: 2.5.1 os: osx osx_image: xcode9.4 - rvm: 2.4.0 os: osx osx_image: xcode8.3 - rvm: 2.4.0 os: osx osx_image: xcode7.3 dist: trusty sudo: true before_install: - gem update --system - gem install bundler -v 1.16.2 cache: bundler