Question 1

What happens when Bazel reaches end of life?

Accepted Answer

When Bazel reaches end of life, it stops receiving security patches, bug fixes, and new features. Currently, 3 Bazel versions are already EOL. The latest supported version is Bazel 9, maintained until December 31, 2028. Running an EOL version exposes your systems to unpatched security vulnerabilities with no official fix available.

Question 2

Is Bazel 9 still supported?

Accepted Answer

Yes. Bazel 9 is actively supported until December 31, 2028. It receives security patches and bug fixes. Check the version table above for the full list of supported Bazel releases and their exact end-of-life dates.

Question 3

Is it safe to use Bazel after end of life?

Accepted Answer

No. Running Bazel after EOL is not safe for production systems. Once a version reaches end of life, newly discovered CVEs are published publicly but never patched — leaving your systems permanently exposed. The only safe path is upgrading to an actively supported Bazel release.

Question 4

How to upgrade from Bazel 6 to Bazel 9.x?

Accepted Answer

To upgrade Bazel from 6 to 9: (1) review the official migration guide for breaking changes, (2) test your application against the new version in a staging environment, (3) update dependencies that have version constraints, (4) run your full test suite, (5) deploy with a rollback plan. The earlier you start, the more time you have to resolve compatibility issues before EOL.

Question 5

When is the next Bazel LTS version?

Accepted Answer

Bazel 9 is the current Long Term Support release, maintained until December 31, 2028. LTS versions are recommended for production deployments that prioritize long-term stability over new features. Plan your upgrades to coincide with LTS releases whenever possible.

Question 6

How long does Bazel support each version?

Accepted Answer

On average, Bazel supports each release for approximately 37 months (~3.1 years). LTS releases like Bazel 9 have extended support windows — maintained until December 31, 2028. The exact EOL date for each version is listed in the table above.

Version	Released	Active support	EOL date	Until EOL	Latest	CVEs	Status
9 LTS	Jan 20, 2026	—	Dec 31, 2028	in 936d	9.1.0	—	Active
8 LTS	Dec 9, 2024	Jan 20, 2026	Dec 31, 2027	in 570d	8.7.0	—	Active
7 LTS	Dec 11, 2023	Dec 9, 2024	Dec 31, 2026	in 205d	7.7.1	—	Active
6 LTS	Dec 19, 2022	Dec 11, 2023	Dec 31, 2025	160d ago	6.6.0	—	EOL
5 LTS	Jan 19, 2022	Dec 19, 2022	Jan 31, 2025	494d ago	5.4.1	—	EOL
4 LTS	Jan 21, 2021	Jan 19, 2022	Jan 31, 2024	860d ago	4.2.4	—	EOL

Bazel End of Life Dates

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