August 2026 Summaries

Semaphore is deprecating and ending the life of MacOS Xcode16 build environments to maintain platform security, reliability, and maintainability, urging users to transition to Xcode26. As operating systems age, they become more vulnerable due to a lack of timely security updates and ecosystem support, increasing operational risks and limiting improvements. The deprecation process will include a series of brownout periods in September 2026, where jobs configured for Xcode16 will temporarily not start, culminating in its complete removal by October 5, 2026. Users must update their pipelines to a supported Xcode version, specifically macos-xcode26, and validate that their pipelines function correctly in the new environment to avoid disruptions. For assistance with the migration, Semaphore provides support and documentation, encouraging users to complete their transition before the brownout periods begin.