Bazel 4 End of Life
Support dates and upgrade guidance — rebuilt from live data.
End of Life
Bazel 4 reached end of life on 31 Jan 2024. It no longer receives security fixes.
921 days without security patches
Recommended action: upgrade to Bazel 9. Check your versionbazel --version
Support timeline
Official dates from the Bazel release process.
| Milestone | Date | Status |
|---|---|---|
| Initial release | 21 Jan 2021 | — |
| End of life | 31 Jan 2024 | 2.5 years ago |
| Active support ended | 19 Jan 2022 | security fixes only after this |
| Latest release | 4.2.4 · 20 Apr 2023 | final |
Where to go from 4
Recommended target: Bazel 9 (supported until 31 Dec 2028).
The newest actively supported branch is Bazel 9 (latest release 9.2.0).
Frequently asked questions
Is Bazel 4 still safe to use?
Bazel 4 reached end of life on 31 Jan 2024, 921 days ago, and is no longer covered by standard support. Running it means no guaranteed security fixes.
Can I still download Bazel 4?
Yes — the final release (4.2.4) generally remains available from vendor archives and OS package mirrors, but installing it means running software with known, unpatched vulnerabilities.
What should I upgrade Bazel 4 to?
Upgrade to Bazel 9, the newest actively supported branch (supported until 31 Dec 2028).