Checkmk 2.3 End of Life
Support dates and upgrade guidance — rebuilt from live data.
Supported
Checkmk 2.3 is actively supported. It reaches end of life on 29 Oct 2026.
81 days of security support left
2.3 latest release
91% of this branch's supported lifetime has elapsed — 29 Apr 2024 → 29 Oct 2026.
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Support timeline
Official dates from the Checkmk release process.
| Milestone | Date | Status |
|---|---|---|
| Initial release | 29 Apr 2024 | — |
| End of life (scheduled) | 29 Oct 2026 | in 81 days |
| Latest release | 2.3 · 29 Apr 2024 | current |
How much runway a newer branch buys
Moving to Checkmk 2.5 extends security support by about 547 days.
| Branch | End of life | Days left | vs 2.3 |
|---|---|---|---|
| Checkmk 2.5 | 28 Apr 2028 | 628 | +547 days |
| Checkmk 2.4 | 6 Nov 2027 | 454 | +373 days |
| Checkmk 2.3 | 29 Oct 2026 | 81 | this branch |
Frequently asked questions
When does Checkmk 2.3 reach end of life?
Checkmk 2.3 reaches end of life on 29 Oct 2026 — 81 days from now. After that date it receives no security fixes.
Is Checkmk 2.3 still supported?
Yes. Checkmk 2.3 is currently maintained. Latest release: 2.3, published 29 Apr 2024.
What happens when Checkmk 2.3 reaches end of life?
Security fixes stop. After 29 Oct 2026 this branch receives no further updates under standard support.
How long do I have to upgrade from Checkmk 2.3?
81 days. Moving to Checkmk 2.5 instead buys roughly 547 more days of security support.