Breaking changes

GitHub Actions is starting the deprecation process for macOS 12. While the image is being deprecated, You may experience longer queue times during peak usage hours. Deprecation will begin on 10/7/24 and the image will be fully unsupported by 12/3/24 for GitHub and by 01/13/25 for ADO.

To raise awareness of the upcoming removal, we will temporarily fail jobs using macOS 12. Builds that are scheduled to run during the brownout periods will fail. The brownouts are scheduled for the following dates and times:

• November 4, 14:00 UTC - November 5, 00:00 UTC
• November 11, 14:00 UTC - November 12, 00:00 UTC
• November 18, 14:00 UTC - November 19, 00:00 UTC
• November 25, 14:00 UTC - November 26, 00:00 UTC

Target date

GitHub - December 3rd, 2024
Azure DevOps - January 13th, 2025

The motivation for the changes

GitHub Actions maintains the latest two stable versions of any given OS version.

Possible impact

Workflows using the macos-12 image label will be terminated with an error.

Platforms affected

• Azure DevOps
• GitHub Actions

Runner images affected

• Ubuntu 20.04
• Ubuntu 22.04
• Ubuntu 24.04
• macOS 12
• macOS 13
• macOS 13 Arm64
• macOS 14
• macOS 14 Arm64
• macOS 15
• macOS 15 Arm64
• Windows Server 2019
• Windows Server 2022

Mitigation ways

Workflows using the macos-12 image label should be updated to macos-latest, macos-13, macos-14 or macos-15.