Google Container-Optimized OS (COS) cos-77 End of Life
Support dates and upgrade guidance — rebuilt from live data.
Google Container-Optimized OS (COS) cos-77 reached end of life on 1 Apr 2021. It no longer receives security fixes.
Support timeline
Official dates from the Google Container-Optimized OS (COS) release process.
| Milestone | Date | Status |
|---|---|---|
| Initial release | 27 Sept 2019 | 7y ago |
| Support Status ended | 1 Apr 2021 | 5y 6mo ago |
| Latest release | cos-77-12371-1109-0 · 11 Jan 2021 | final |
Where to go from cos-77
Recommended target: Google Container-Optimized OS (COS) cos-133 (supported until 1 Nov 2028).
The newest actively supported branch is Google Container-Optimized OS (COS) cos-133 (latest release cos-133-19999-44-85).
Frequently asked questions
Is Google Container-Optimized OS (COS) cos-77 still safe to use?
Google Container-Optimized OS (COS) cos-77 reached end of life on 1 Apr 2021, 2,013 days ago, and is no longer covered by standard support. Running it means no guaranteed security fixes.
Can I still download Google Container-Optimized OS (COS) cos-77?
Yes — the final release (cos-77-12371-1109-0) generally remains available from vendor archives and OS package mirrors, but installing it means running software with known, unpatched vulnerabilities.
What should I upgrade Google Container-Optimized OS (COS) cos-77 to?
Upgrade to Google Container-Optimized OS (COS) cos-133, the newest actively supported branch (supported until 1 Nov 2028).