Symfony 5.1 End of Life
Support dates and upgrade guidance — rebuilt from live data.
Symfony 5.1 reached end of life on 21 Jan 2021. It no longer receives security fixes.
Support timeline
Official dates from the Symfony release process.
| Milestone | Date | Status |
|---|---|---|
| Initial release | 31 May 2020 | — |
| End of life | 21 Jan 2021 | 5.6 years ago |
| Latest release | 5.1.11 · 27 Jan 2021 | final |
Where to go from 5.1
Recommended target: Symfony 8.1 (supported until 31 Jan 2027).
The newest actively supported branch is Symfony 8.1 (latest release 8.1.4).
Frequently asked questions
Is Symfony 5.1 still safe to use?
Symfony 5.1 reached end of life on 21 Jan 2021, 2,026 days ago, and is no longer covered by standard support. Running it means no guaranteed security fixes.
Can I still download Symfony 5.1?
Yes — the final release (5.1.11) generally remains available from vendor archives and OS package mirrors, but installing it means running software with known, unpatched vulnerabilities.
What should I upgrade Symfony 5.1 to?
Upgrade to Symfony 8.1, the newest actively supported branch (supported until 31 Jan 2027).