Summary

macOS 15 is now generally available for GitHub-hosted runners. It will also become the latest macOS runner image with workflows migrating from November 2024 through December 2024.

Intended Outcome

Apple developers require the latest version of macOS and Xcode now have access to newer versions

How will it work?

Actions workflows using the macos-latest label will incrementally transition from macOS 14 to macOS 15 beginning November 2024 and will conclude before the end of December 2024. This also applies to larger macOS runners, for which the following YAML workflow labels can be used:

• macos-latest-xlarge
• macos-latest-large

jobs:
  build:
    runs-on: macos-latest
    steps:
      - uses: actions/checkout@v4
      - name: Build
        run: swift build
      - name: Run tests
        run: swift test

To use macOS 15 directly, update the runs-on: key in you workflow file to macos-15, macos-15-large, or macos-15-xlarge

jobs:
  build:
    runs-on: macos-14
    steps:
      - uses: actions/checkout@v4
      - name: Build
        run: swift build
      - name: Run tests
        run: swift test