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Version Released Active Support Critical Support Release
5.x (LTS) 4 months and 3 weeks ago
(05 May 2021)
Yes Yes 5.1.1
4.x (LTS) 3 years and 8 months ago
(18 Jan 2018)
No Ends in 1 year
(01 Nov 2022)
4.6.0
3.x 8 years ago
(19 Aug 2013)
No Ended 2 years ago
(24 Jul 2019)
NA
2.x 8 years ago
(18 Jul 2013)
No Ended 8 years ago
(19 Aug 2013)
NA

Bootstrap is the most popular HTML, CSS, and JavaScript framework for developing responsive, mobile first projects on the web.

At times to be determined by the release working group, major versions will be frozen and transitioned to Long Term Support (LTS). After a determined period of time, versions in Long Term Support will be deep-frozen and transition to Maintenance.

Versions in Maintenance should not have any changes landed, except for:

  • Critical bug fixes
  • Critical security updates
  • Important documentation updates

Unless a change is urgent, Maintenance releases are likely to be made with minimal frequency. The v4 branch is currently in Active LTS and will receive bug fixes till 2021-07-01, after which it will only receive critical fixes till its End of Life.

More information is available on the Bootstrap website.

You should be running one of the supported release numbers listed above in the rightmost column.


You can submit an improvement to this page by visiting GitHub. You will need to fork the website and submit a Pull Request. A JSON version of this page is available at /api/bootstrap.json. See the API Documentation for more.