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GitHub Actions ubuntu-latest migrates to Ubuntu 26.04
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Why it matters
- →The default GitHub Actions runner OS is upgrading, risking silent CI/CD breakages for unpinned workflows.
- →Developers must actively pin runners to ubuntu-24.04 if they cannot immediately support Ubuntu 26.04 tooling changes.
- →The migration window provides a two-month grace period to test and adjust before the automatic switch occurs.
GitHub has announced that the ubuntu-latest label for GitHub Actions will migrate from Ubuntu 24.04 to Ubuntu 26.04 between October 19 and November 19, 2026. The new runner image is now generally available for x64 and arm64 architectures. Because Ubuntu 26.04 includes updated or removed tools compared to its predecessor, workflows dependent on specific software versions may fail after the migration. Users are advised to test against ubuntu-26.04 immediately or pin their workflows to ubuntu-24.04 to maintain current behavior.
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GitHub Actions execution protections GA
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