- os: osx
osx_image: xcode7.3 # OS X 10.11
- os: osx
- osx_image: xcode8 # OS X 10.11
+ osx_image: xcode8.3 # OS X 10.12
- os: osx
- osx_image: xcode8.1 # OS X 10.12
+ osx_image: xcode9 # OS X 10.13
- os: osx
- osx_image: xcode8.3 # OS X 10.12
+ osx_image: xcode9.1 # OS X 10.13.1
- os: linux
dist: trusty
sudo: required