Bootstrap 4 End of Life
Support dates and upgrade guidance — rebuilt from live data.
End of Life
Bootstrap 4 reached end of life on 1 Jan 2023. It no longer receives security fixes.
1,373 days without security patches
Recommended action: upgrade to Bootstrap 5. Support timeline
Official dates from the Bootstrap release process.
| Milestone | Date | Status |
|---|---|---|
| Initial release | 18 Jan 2018 | 8y 9mo ago |
| Active Support ended | 1 Nov 2021 | security fixes only after this |
| Critical Support ended | 1 Jan 2023 | 3y 9mo ago |
| Latest release | 4.6.2 · 19 Jul 2022 | final |
Where to go from 4
Recommended target: Bootstrap 5.
The newest actively supported branch is Bootstrap 5 (latest release 5.3.8).
Frequently asked questions
Is Bootstrap 4 still safe to use?
Bootstrap 4 reached end of life on 1 Jan 2023, 1,373 days ago, and is no longer covered by standard support. Running it means no guaranteed security fixes.
Can I still download Bootstrap 4?
Yes — the final release (4.6.2) generally remains available from vendor archives and OS package mirrors, but installing it means running software with known, unpatched vulnerabilities.
What should I upgrade Bootstrap 4 to?
Upgrade to Bootstrap 5, the newest actively supported branch.