Starting on Saturday we will run all builds that select Xcode 8.3 in their
circle.yml on Xcode 8.3.2 instead.
Apple is planning to deprecate Xcode 8.3 soon (see the Xcode release notes, specifically the section about Xcode 8.3.1) , so we are making this change to make sure that you can continue to publish the applications you build on CircleCI to the App Store.
If you wish to continue using Xcode 8.3 specifically, you can add the following to your circle.yml:
xcode: version: "8.3.0"
Please note that we will remove support for Xcode 8.3.0 on May 5th 2017.