- Each Buildkite agent minor release is supported for one year from its first stable release, with the final three months serving as a deprecation period that includes upgrade warnings.
- Support windows are fixed; installing or patching an agent does not reset the timer. v3.115.x and earlier lose support on 1 Jan 2027, and all v3 releases end on 3 Sep 2027.
- Upgrade to the latest patch of your current minor line or migrate to v4 before the final v3 support window expires.