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+# Automate updating runner version
+
+**Status**: Proposed
+
+## Context
+
+When a new [runner](https://github.com/actions/runner) version is released, new
+images need to be built in
+[actions-runner-controller/releases](https://github.com/actions-runner-controller/releases).
+This is currently started by the
+[release-runners](https://github.com/actions/actions-runner-controller/blob/master/.github/workflows/release-runners.yaml)
+workflow, although this only starts when the set of file containing the runner
+version is updated (and this is currently done manually).
+
+## Decision
+
+We can have another workflow running on a cadence (hourly seems sensible) and checking for new runner
+releases, creating a PR updating `RUNNER_VERSION` in:
+- `.github/workflows/release-runners.yaml`
+- `Makefile`
+- `runner/Makefile`
+- `test/e2e/e2e_test.go`
+
+Once that PR is merged, the existing workflow will pick things up.
+
+## Consequences
+
+We don't have to add an extra step to the runner release process and a direct
+dependency on ARC. Since images won't be built until the generated PR is merged
+we still have room to wait before triggering a build should there be any
+problems with the runner release.
+
+## Considered alternatives
+
+We also considered firing the workflow to create the PR via
+`repository_dispatch` as part of the release process of runner itself, but we
+discarded it because that would have required a PAT or a GitHub app with `repo`
+scope within the Actions org and would have added a new direct dependency on the
+runner side.
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