The upcoming release of Xcode 16 in September 2024 will bring significant changes to Bitrise's stack offerings. The new Stable stack based on Xcode 16 will introduce breaking changes compared to the existing stable stacks (Xcode 14.x and 15.x), while the Edge stack will continue to provide a testing ground for workflows before they reach the Stable state. Users are advised to test and adapt with the available Xcode 16.0 edge stack, as Apple will only accept apps built with Xcode 16 in the App Store starting from April 2025. The new stack will feature updated tooling defaults, modernized tooling, and breaking changes for some workflows. Existing stable stacks will not receive these breaking changes, providing a transition period for users to prepare and migrate to the new Stable stack.