Squid 4 End of Life
Support dates and upgrade guidance — rebuilt from live data.
End of Life
Squid 4 reached end of life on 4 Oct 2021. It no longer receives security fixes.
1,770 days without security patches
Recommended action: upgrade to Squid 7. Check your versionsquid -v
Support timeline
Official dates from the Squid release process.
| Milestone | Date | Status |
|---|---|---|
| Initial release | 3 Jul 2018 | — |
| End of life | 4 Oct 2021 | 4.8 years ago |
| Latest release | 4.17 · 4 Oct 2021 | final |
Where to go from 4
Recommended target: Squid 7.
The newest actively supported branch is Squid 7 (latest release 7.6).
Frequently asked questions
Is Squid 4 still safe to use?
Squid 4 reached end of life on 4 Oct 2021, 1,770 days ago, and is no longer covered by standard support. Running it means no guaranteed security fixes.
Can I still download Squid 4?
Yes — the final release (4.17) generally remains available from vendor archives and OS package mirrors, but installing it means running software with known, unpatched vulnerabilities.
What should I upgrade Squid 4 to?
Upgrade to Squid 7, the newest actively supported branch.