Mastodon 4.3 End of Life
Support dates and upgrade guidance — rebuilt from live data.
End of Life
Mastodon 4.3 reached end of life on 6 May 2026. It no longer receives security fixes.
95 days without security patches
Recommended action: upgrade to Mastodon 4.6. Check your versiontootctl --version
Support timeline
Official dates from the Mastodon release process.
| Milestone | Date | Status |
|---|---|---|
| Initial release | 8 Oct 2024 | — |
| End of life | 6 May 2026 | 0.3 years ago |
| Latest release | 4.3.23 · 20 May 2026 | final |
Where to go from 4.3
Recommended target: Mastodon 4.6.
The newest actively supported branch is Mastodon 4.6 (latest release 4.6.5).
Frequently asked questions
Is Mastodon 4.3 still safe to use?
Mastodon 4.3 reached end of life on 6 May 2026, 95 days ago, and is no longer covered by standard support. Running it means no guaranteed security fixes.
Can I still download Mastodon 4.3?
Yes — the final release (4.3.23) generally remains available from vendor archives and OS package mirrors, but installing it means running software with known, unpatched vulnerabilities.
What should I upgrade Mastodon 4.3 to?
Upgrade to Mastodon 4.6, the newest actively supported branch.