<html><head><meta http-equiv="Content-Type" content="text/html charset=utf-8"><meta http-equiv="Content-Type" content="text/html charset=utf-8"><meta http-equiv="Content-Type" content="text/html charset=utf-8"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class="">Hi All-<div class=""><br class=""></div><div class=""><div class="">Tomorrow, we will be temporarily bringing down the CI, starting around <b class="">11 AM</b>, California time, in order to upgrade to the latest beta of Xcode 9 and the associated SDKs. We will also be briefly locking master while we land some source changes in support of the updated SDKs on both master and the swift-4.0-branch. We expect the upgrade process to take an hour or two. We’ll send out a message when the upgrade is complete.</div><div class=""><br class="">As a reminder,<b class=""> once the upgrade is complete, if you are doing development on a Mac, the minimum required Xcode to build Swift from source will be the latest Xcode 9 beta. </b><span class="">The beta can be downloaded at: <a href="https://developer.apple.com/download/" class="">https://developer.apple.com/download/</a></span></div></div><div class=""><br class=""></div><div class="">Thanks!</div><div class="">nicole</div><div class=""><br class=""></div></body></html>