Prerequisites

• Xcode 26 is available in CIPD
• Upgrade 50% of devicelab bots in each pool to macOS 15.7.1 #176932 (assuming Xcode 26 requires macOS 15.7)
  • If Xcode 26 requires a higher macOS version, bots will need to be upgraded to new required version before doing
• Upgrade 50% of chromium bots to macOS 15.7.1 #176933 (assuming Xcode 26 requires macOS 15.7)
  • If Xcode 26 requires a higher macOS version, bots will need to be upgraded to new required version before doing

Instructions for Non-devicelab tests

Make a PR with the following:

• Replace Mac version in ci.yaml to macOS 17

• https://github.com/flutter/flutter/blob/master/.ci.yaml

- os: Mac-15.5|Mac-15.7
+ os: Mac-15.7

- os: Mac-15.1|Mac-15.5|Mac-15.6|Mac-15.7
+ os: Mac-15.7

- ["device_os=iOS-17","os=Mac-15.1|Mac-15.5|Mac-15.6|Mac-15.7", "cpu=x86"]
+ ["device_os=iOS-17","os=Mac-15.7", "cpu=x86"]

• https://github.com/flutter/flutter/blob/master/engine/src/flutter/.ci.yaml
• https://github.com/flutter/flutter/blob/master/engine/src/flutter/ci/builders/linux_web_engine_test.json
• https://github.com/flutter/flutter/blob/master/engine/src/flutter/ci/builders/local_engine.json
• https://github.com/flutter/flutter/blob/master/engine/src/flutter/ci/builders/mac_android_aot_engine.json
• https://github.com/flutter/flutter/blob/master/engine/src/flutter/ci/builders/mac_clang_tidy.json
• https://github.com/flutter/flutter/blob/master/engine/src/flutter/ci/builders/mac_host_engine.json
• https://github.com/flutter/flutter/blob/master/engine/src/flutter/ci/builders/mac_ios_engine.json
• https://github.com/flutter/flutter/blob/master/engine/src/flutter/ci/builders/mac_unopt.json

- os: Mac-15.5|Mac-15.7
+ os: Mac-15.7

- os=Mac-15.5|Mac-15.7
+ os=Mac-15.7

- specificOS: 'Mac-15.5|Mac-15.7'
+ specificOS: 'Mac-15.7'

• Replace sdk_version with 17a400

- "sdk_version": "16c5032a"
+ "sdk_version": "17a400"

See example: https://github.com/flutter/flutter/pull/170288/files

Instructions for devicelab test

Mac_ios, Mac_x64_ios, and Mac_arm64_ios will likely need to be run manually with led

Example command:

led get-builder "luci.flutter.staging:Mac_ios channels_integration_test_ios" | led edit -d os=Mac-15.7 | led edit -p '$flutter/osx_sdk={"sdk_version": "17a400"}' | led edit -d pool=luci.flutter.staging | led launch