Container-Optimized OS Release Notes

The following table provides a summary of Container-Optimized OS releases available on Compute Engine:

Active Milestones

OS version Image project Image family Built by End of support Release notes
COS 93 BETA cos-cloud cos-beta Google September 2023 milestone 93
COS 89 LTS cos-cloud cos-89-lts Google March 2023 milestone 89
COS 85 LTS cos-cloud cos-85-lts Google December 2021 milestone 85
COS 81 LTS cos-cloud cos-81-lts Google September 20211 milestone 81

Deprecated Milestones

OS version Image project Image family Built by Deprecation date Release notes
COS 77 LTS cos-cloud cos-77-lts Google April 20211 milestone 77
COS 73 LTS cos-cloud cos-73-lts Google June 2020 milestone 73
COS 69 LTS cos-cloud cos-69-lts Google December 2019 milestone 69
  1. COS 77 LTS and COS 81 LTS, when bundled with GKE, have slightly longer support durations. GKE users should consult the GKE release schedule for details.

Development Release Notes

For release notes related to the milestone under development, see the Development Release Notes page.
For release notes related to cos-dev before M93, see the Legacy Release Notes page.