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

Release Released Active Support Critical Support Commercial Support Latest
5 (LTS) 3 years ago
(05 May 2021)
Yes Yes Unavailable 5.3.3
(20 Feb 2024)
4 (LTS) 6 years ago
(18 Jan 2018)
No Ended 1 year and 6 months ago
(01 Jan 2023)
Yes 4.6.2
(19 Jul 2022)
3 10 years ago
(19 Aug 2013)
No Ended 4 years and 12 months ago
(24 Jul 2019)
Yes 3.4.1
(13 Feb 2019)
2 12 years ago
(31 Jan 2012)
No Ended 10 years ago
(19 Aug 2013)
Unavailable 2.3.2
(26 Jul 2013)

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 (Critical Support).

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.

Bootstrap versions 3 and 4 have reached end of life. Commercial support is available for these versions through the HeroDevs Never-Ending Support initiative. For more information, see Bootstrap 3.4.1 and 4.6.x docs.

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 on GitHub :octocat: . This page has a corresponding Talk Page.

A JSON version of this page is available at /api/bootstrap.json. See the API Documentation for more information. You can subscribe to the iCalendar feed at /calendar/bootstrap.ics.