Bootstrap

css-runtime framework herodevs javascript-runtime

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 and 12 months ago
(05 May 2021)
 Yes Yes Unavailable 5.3.5
(04 Apr 2025)
4 (LTS) 7 years ago
(18 Jan 2018)
 Ended 3 years and 6 months ago
(01 Nov 2021)
 Ended 2 years and 4 months ago
(01 Jan 2023)
 Yes 4.6.2
(19 Jul 2022)
3 (LTS) 11 years ago
(19 Aug 2013)
 Ended 8 years ago
(05 Sep 2016)
 Ended 5 years and 9 months ago
(24 Jul 2019)
 Yes 3.4.1
(13 Feb 2019)
2 13 years ago
(31 Jan 2012)
 Ended 11 years ago
(19 Aug 2013)
 Ended 11 years ago
(19 Aug 2013)
 Yes 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.

Commercial support for some EOL versions of Bootstrap is available through the HeroDevs Never-Ending Support initiative.

More information is available on the Bootstrap website.

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

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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.