Eclipse Temurin 21 End of Life
Support dates and upgrade guidance — rebuilt from live data.
Supported
Eclipse Temurin 21 is actively supported. It reaches end of life on 31 Dec 2029.
1,183 days of security support left
21.0.12.1+1 latest release
48% of this branch's supported lifetime has elapsed — 10 Oct 2023 → 31 Dec 2029.
Check your versionjava -version
Support timeline
Official dates from the Eclipse Temurin release process.
| Milestone | Date | Status |
|---|---|---|
| Initial release | 10 Oct 2023 | 3y ago |
| Security Support ends | 31 Dec 2029 | in 3y 3mo |
| Latest release | 21.0.12.1+1 · 19 Aug 2026 | current |
How much runway a newer branch buys
Moving to Eclipse Temurin 27 extends security support by about -1,014 days.
| Branch | End of life | Days left | vs 21 |
|---|---|---|---|
| Eclipse Temurin 27 | 23 Mar 2027 | 169 | -1,014 days |
| Eclipse Temurin 25 | 30 Sept 2031 | 1,821 | +638 days |
| Eclipse Temurin 21 | 31 Dec 2029 | 1,183 | this branch |
| Eclipse Temurin 17 | 31 Oct 2027 | 391 | -792 days |
| Eclipse Temurin 11 | 31 Oct 2027 | 391 | -792 days |
| Eclipse Temurin 8 | 31 Dec 2030 | 1,548 | +365 days |
Frequently asked questions
When does Eclipse Temurin 21 reach end of life?
Eclipse Temurin 21 reaches end of life on 31 Dec 2029 — 1,183 days from now. After that date it receives no security fixes.
Is Eclipse Temurin 21 still supported?
Yes. Eclipse Temurin 21 is currently maintained. Latest release: 21.0.12.1+1, published 19 Aug 2026.
What happens when Eclipse Temurin 21 reaches end of life?
Security fixes stop. After 31 Dec 2029 this branch receives no further updates under standard support.
How long do I have to upgrade from Eclipse Temurin 21?
1,183 days. Moving to Eclipse Temurin 27 instead buys roughly -1,014 more days of security support.