Fluent Bit 4.2 End of Life
Support dates and upgrade guidance — rebuilt from live data.
End of Life
Fluent Bit 4.2 reached end of life on 30 Jun 2026. It no longer receives security fixes.
40 days without security patches
Recommended action: upgrade to Fluent Bit 5.0. Check your versionfluent-bit -v
Support timeline
Official dates from the Fluent Bit release process.
| Milestone | Date | Status |
|---|---|---|
| Initial release | 11 Nov 2025 | — |
| End of life | 30 Jun 2026 | 0.1 years ago |
| Latest release | 4.2.8 · 4 Aug 2026 | final |
Where to go from 4.2
Recommended target: Fluent Bit 5.0.
The newest actively supported branch is Fluent Bit 5.0 (latest release 5.0.9).
Frequently asked questions
Is Fluent Bit 4.2 still safe to use?
Fluent Bit 4.2 reached end of life on 30 Jun 2026, 40 days ago, and is no longer covered by standard support. Running it means no guaranteed security fixes.
Can I still download Fluent Bit 4.2?
Yes — the final release (4.2.8) generally remains available from vendor archives and OS package mirrors, but installing it means running software with known, unpatched vulnerabilities.
What should I upgrade Fluent Bit 4.2 to?
Upgrade to Fluent Bit 5.0, the newest actively supported branch.