Question 1

What happens when Bootstrap reaches end of life?

Accepted Answer

When Bootstrap reaches end of life, it stops receiving security patches, bug fixes, and new features. Currently, 3 Bootstrap versions are already EOL. The latest supported version is Bootstrap 5. Running an EOL version exposes your systems to unpatched security vulnerabilities with no official fix available.

Question 2

Is Bootstrap 5 still supported?

Accepted Answer

Yes. Bootstrap 5 is actively supported. It receives security patches and bug fixes. Check the version table above for the full list of supported Bootstrap releases and their exact end-of-life dates.

Question 3

Is it safe to use Bootstrap after end of life?

Accepted Answer

No. Running Bootstrap 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 Bootstrap release.

Question 4

How to upgrade from Bootstrap 4 to Bootstrap 5.x?

Accepted Answer

To upgrade Bootstrap from 4 to 5: (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 Bootstrap LTS version?

Accepted Answer

Bootstrap 5 is the current Long Term Support release, maintained until —. 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 Bootstrap support each version?

Accepted Answer

On average, Bootstrap supports each release for approximately 50 months (~4.2 years). LTS releases like Bootstrap 5 have extended support windows — maintained until —. The exact EOL date for each version is listed in the table above.

Version	Released	Active support	EOL date	Until EOL	Latest	CVEs	Status
5 LTS	May 5, 2021	—	No	—	5.3.8	—	Active
4 LTS	Jan 18, 2018	Nov 1, 2021	Jan 1, 2023	1255d ago	4.6.2	—	EOL
3 LTS	Aug 19, 2013	Sep 5, 2016	Jul 24, 2019	2512d ago	3.4.1	—	EOL
2	Jan 31, 2012	Aug 19, 2013	Aug 19, 2013	4677d ago	2.3.2	—	EOL

Bootstrap End of Life Dates

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