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GitHub Actions: ubuntu-latest moves to Ubuntu 26.04 from 19 October

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By TrustList Editorial

From 19 October to 19 November 2026, GitHub moves the ubuntu-latest runner label from Ubuntu 24.04 to 26.04. Teams should test pipelines on ubuntu-26.04 now or pin ubuntu-24.04 to avoid unexpected build breaks.

About GitHub Actions: ubuntu-latest moves to Ubuntu 26.04 from 19 October

GitHub Actions: ubuntu-latest moves to Ubuntu 26.04 from 19 October

22 September 2026 — GitHub said on 17 September 2026 that its Ubuntu 26.04 runner image for GitHub Actions is now generally available on x64 and arm64, and that the ubuntu-latest label will move from Ubuntu 24.04 to Ubuntu 26.04. The change rolls out gradually between 19 October and 19 November 2026. During that window, workflows that use ubuntu-latest move to the new image automatically.

Not yet independently verified. Both sources are GitHub's own (its changelog and its runner-images repository); they agree on the dates, but we found no independent coverage to corroborate them. We will update this when it can be confirmed, and remove this note.

GitHub's runner-images repository carries its own announcement (issue 14748, opened on 17 September). Its dates match the changelog: a rollout over several weeks beginning on 19 October 2026, with completion planned by 19 November 2026. The issue title says the label will use Ubuntu 26.04 "in November 2026", which reflects the completion date rather than the start.

What changes

  • The labels ubuntu-26.04 and ubuntu-26.04-arm can be used now. GitHub's general-availability notice (issue 14747) says both images have completed their public preview and are supported for production work.
  • The migration notice says GitHub monitored customer feedback and image stability before deciding to move the label.
  • The runner-images announcement says the ubuntu-latest change applies to the x64 label, and lists Azure DevOps as well as GitHub Actions among the affected platforms.
  • GitHub warns that Ubuntu 26.04 updates some tools and removes others, which can break workflows that depend on particular software versions or preinstalled packages. Its comparison table shows a new operating system release (26.04.1 LTS) with a newer kernel and systemd, while many listed tools stay at the same versions and Java 17 remains the default. GitHub says the table is not a complete list.

What to do

  • Find every workflow that uses ubuntu-latest across your organisation's repositories, including shared and reusable workflows.
  • Test now. Run important pipelines against ubuntu-26.04 before 19 October, and check the full software list for the image in the runner-images repository.
  • Pin if you are not ready. GitHub says workflows can be pinned to ubuntu-24.04 to stay on the current image.
  • Ask suppliers who build software for you on GitHub-hosted runners whether their pipelines are pinned or tested, so an image change does not quietly alter what they deliver.
  • Watch for failures during the rollout window. If a workflow breaks, GitHub's advice is to switch it back to ubuntu-24.04, test explicitly on ubuntu-26.04, and report the problem as an issue in the runner-images repository.

What the notices leave out

Neither the changelog nor the runner-images issue says how long Ubuntu 24.04 will remain available for pinned workflows, or how GitHub will sequence the gradual rollout across organisations.

Sources

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