Google Container-Optimized OS (COS) cos-133 End of Life
Support dates and upgrade guidance — rebuilt from live data.
Google Container-Optimized OS (COS) cos-133 is actively supported. It reaches end of life on 1 Nov 2028.
Support timeline
Official dates from the Google Container-Optimized OS (COS) release process.
| Milestone | Date | Status |
|---|---|---|
| Initial release | 28 Sept 2026 | this month |
| Support Status ends | 1 Nov 2028 | in 2y 1mo |
| Latest release | cos-133-19999-44-85 · 28 Sept 2026 | current |
How much runway a newer branch buys
Google Container-Optimized OS (COS) cos-133 is the newest branch — this is the longest runway currently available.
| Branch | End of life | Days left | vs cos-133 |
|---|---|---|---|
| Google Container-Optimized OS (COS) cos-133 | 1 Nov 2028 | 758 | this branch |
| Google Container-Optimized OS (COS) cos-129 | 1 Jul 2028 | 635 | -123 days |
| Google Container-Optimized OS (COS) cos-125 | 1 Feb 2028 | 484 | -274 days |
| Google Container-Optimized OS (COS) cos-121 | 1 Mar 2027 | 147 | -611 days |
Frequently asked questions
When does Google Container-Optimized OS (COS) cos-133 reach end of life?
Google Container-Optimized OS (COS) cos-133 reaches end of life on 1 Nov 2028 — 758 days from now. After that date it receives no security fixes.
Is Google Container-Optimized OS (COS) cos-133 still supported?
Yes. Google Container-Optimized OS (COS) cos-133 is currently maintained. Latest release: cos-133-19999-44-85, published 28 Sept 2026.
What happens when Google Container-Optimized OS (COS) cos-133 reaches end of life?
Security fixes stop. After 1 Nov 2028 this branch receives no further updates under standard support.
How long do I have to upgrade from Google Container-Optimized OS (COS) cos-133?
758 days. This is already the newest branch, so this is the longest runway currently available.