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Bootstrap
Active
Libraries & SDKs Latest Version: 5.3.8 Latest Release: Aug 25, 2025
Bootstrap is the world's most popular CSS framework for responsive, mobile-first front-end development.
Versions
4
Latest Version
5.3.8
Active Support
1
EOL
3
Lifecycle Timeline
Today ↓
5
5
4
4
3
3
2
2
Active SupportSecurity SupportEOL
Versions
| Release | Release Date | Active Support | EOL | Latest Version | LTS | Status |
|---|---|---|---|---|---|---|
| 5 | May 5, 2021 | Yes | No | 5.3.8 | 2022-07-19 | Active |
| 4 | Jan 18, 2018 | Nov 1, 2021 | Jan 1, 2023 | 4.6.2 | 2019-11-26 | EOL |
| 3 | Aug 19, 2013 | Sep 5, 2016 | Jul 24, 2019 | 3.4.1 | 2014-11-01 | EOL |
| 2 | Jan 31, 2012 | Aug 19, 2013 | Aug 19, 2013 | 2.3.2 | No | EOL |
Frequently Asked Questions
Which versions of Bootstrap have reached end of life?
The following Bootstrap versions have reached end of life and no longer receive security updates: 4, 3, 2. It is recommended to upgrade to a supported version.
Is it safe to continue using Bootstrap 4?
Bootstrap 4 has reached end of life and no longer receives security patches or bug fixes. Continuing to use it may expose your systems to known vulnerabilities. We strongly recommend upgrading to a supported version.
What is the latest version of Bootstrap?
The latest version of Bootstrap is 5.3.8, released in the 5 release cycle.
How many versions of Bootstrap are currently supported?
Bootstrap currently has 1 actively supported version(s): 5.
When does Bootstrap 5 reach end of life?
Bootstrap 5 does not have a specific end-of-life date announced yet.
What should I do when Bootstrap reaches end of life?
When a Bootstrap version reaches end of life, you should: 1) Plan your migration to a supported version as soon as possible. 2) Review the release notes for breaking changes. 3) Test your applications thoroughly in a staging environment. 4) Update your dependencies to ensure compatibility with the new version.