This update makes Xcode 9 Beta available for all macOS builds. Specify version 9.0 in your circle.yml file to override the default.
Xcode 9 Beta 1 Availability
Jun 06, 2017
MaintenanceJun 06, 2017
MaintenanceThis update makes Xcode 9 Beta available for all macOS builds. Specify version 9.0 in your circle.yml file to override the default.