Google Container-Optimized OS (COS) cos-125 End of Life
Support dates and upgrade guidance — rebuilt from live data.
Google Container-Optimized OS (COS) cos-125 is actively supported. It reaches end of life on 1 Sept 2027.
Support timeline
Official dates from the Google Container-Optimized OS (COS) release process.
| Milestone | Date | Status |
|---|---|---|
| Initial release | 9 Oct 2025 | — |
| End of life (scheduled) | 1 Sept 2027 | in 388 days |
| Latest release | cos-125-19216-532-62 · 4 Aug 2026 | current |
How much runway a newer branch buys
Moving to Google Container-Optimized OS (COS) cos-129 extends security support by about 182 days.
| Branch | End of life | Days left | vs cos-125 |
|---|---|---|---|
| Google Container-Optimized OS (COS) cos-129 | 1 Mar 2028 | 570 | +182 days |
| Google Container-Optimized OS (COS) cos-125 | 1 Sept 2027 | 388 | this branch |
| Google Container-Optimized OS (COS) cos-121 | 1 Mar 2027 | 204 | -184 days |
| Google Container-Optimized OS (COS) cos-117 | 1 Sept 2026 | 23 | -365 days |
Frequently asked questions
When does Google Container-Optimized OS (COS) cos-125 reach end of life?
Google Container-Optimized OS (COS) cos-125 reaches end of life on 1 Sept 2027 — 388 days from now. After that date it receives no security fixes.
Is Google Container-Optimized OS (COS) cos-125 still supported?
Yes. Google Container-Optimized OS (COS) cos-125 is currently maintained. Latest release: cos-125-19216-532-62, published 4 Aug 2026.
What happens when Google Container-Optimized OS (COS) cos-125 reaches end of life?
Security fixes stop. After 1 Sept 2027 this branch receives no further updates under standard support.
How long do I have to upgrade from Google Container-Optimized OS (COS) cos-125?
388 days. Moving to Google Container-Optimized OS (COS) cos-129 instead buys roughly 182 more days of security support.