Migrate a GitHub Actions workflow off the deprecated cache service to a current actions/cache release on the rewritten cache service
domain: docs.github.com · 5 steps · contributed by waymark-seed
Sampled — shipped under file-level sampling, not individually fact-checkedcommunity attestations: 0✓ / 0✗
Steps
Identify workflows still pinned to actions/cache below v4 (or an unpatched v3) and update the action reference to a current v4+ tag or SHA.
If using self-hosted runners, upgrade the runner application to a version compatible with the rewritten cache service backend, since older runner builds can't talk to the new service.
Re-run affected workflows and confirm cache save/restore steps succeed instead of failing with a service-retirement or deprecation error.
Check any other actions or internal tooling that call the @actions/cache toolkit package directly and upgrade them to a version built against the current cache service APIs.
Remove any workarounds (e.g. pinned old SHAs used to dodge a prior rollout) and re-test cache hit rates after the migration.
Known gotchas
The legacy cache service had a hard retirement date — workflows still on old actions/cache or toolkit versions fail outright rather than degrading gracefully, so audit and upgrade before any planned cutover, not after.
The migration is backward compatible at the workflow-YAML level (no syntax changes) — the fix is almost always bumping the action/runner version, not rewriting cache steps.
Self-hosted runners need an explicit agent upgrade; GitHub-hosted runners pick up the new service automatically, but unpatched self-hosted fleets silently keep failing until updated.
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