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Container-Optimized OS
Active
Operating Systems Latest Version: cos-125-19216-104-142 Latest Release: Feb 10, 2026
Container-Optimized OS (COS) is a Google-managed OS image optimized for running Docker containers on Google Cloud.
Versions
15
Latest Version
cos-125-19216-104-142
Active Support
4
EOL
11
Lifecycle Timeline
Today ↓
cos-125
cos-125
cos-121
cos-121
cos-117
cos-117
cos-113
cos-113
cos-109
cos-109
cos-105
cos-105
cos-101
cos-101
cos-97
cos-97
cos-93
cos-93
cos-89
cos-89
Active SupportSecurity SupportEOL
Versions
| Release | Release Date | Active Support | EOL | Latest Version | LTS | Status |
|---|---|---|---|---|---|---|
| cos-125 | Oct 9, 2025 | - | Sep 1, 2027 | cos-125-19216-104-142 | Yes | Active |
| cos-121 | Apr 14, 2025 | - | Mar 1, 2027 | cos-121-18867-294-116 | Yes | Active |
| cos-117 | Oct 2, 2024 | - | Sep 1, 2026 | cos-117-18613-439-120 | Yes | Active |
| cos-113 | Apr 15, 2024 | - | Mar 1, 2026 | cos-113-18244-582-2 | Yes | Active |
| cos-109 | Sep 27, 2023 | - | Sep 1, 2025 | cos-109-17800-570-50 | Yes | EOL |
| cos-105 | Apr 3, 2023 | - | Apr 1, 2025 | cos-105-17412-535-98 | Yes | EOL |
| cos-101 | Sep 15, 2022 | - | Sep 1, 2024 | cos-101-17162-528-64 | Yes | EOL |
| cos-97 | Mar 29, 2022 | - | Mar 1, 2024 | cos-97-16919-450-41 | Yes | EOL |
| cos-93 | Oct 18, 2021 | - | Oct 1, 2023 | cos-93-16623-461-42 | Yes | EOL |
| cos-89 | Apr 7, 2021 | - | Mar 1, 2023 | cos-89-16108-798-22 | Yes | EOL |
| cos-85 | Sep 24, 2020 | - | Sep 1, 2022 | cos-85-13310-1498-13 | Yes | EOL |
| cos-81 | Mar 27, 2020 | - | Sep 1, 2021 | cos-81-12871-1317-8 | Yes | EOL |
| cos-77 | Sep 27, 2019 | - | Apr 1, 2021 | cos-77-12371-1109-0 | Yes | EOL |
| cos-73 | Mar 25, 2019 | - | Jun 1, 2020 | cos-73-11647-656-0 | Yes | EOL |
| cos-69 | Sep 18, 2018 | - | Dec 1, 2019 | cos-69-10895-385-0 | Yes | EOL |
Frequently Asked Questions
Which versions of Container-Optimized OS have reached end of life?
The following Container-Optimized OS versions have reached end of life and no longer receive security updates: cos-109, cos-105, cos-101, cos-97, cos-93, cos-89, cos-85, cos-81 (and 3 more). It is recommended to upgrade to a supported version.
Is it safe to continue using Container-Optimized OS cos-109?
Container-Optimized OS cos-109 has reached end of life and no longer receives security patches or bug fixes. Continuing to use it may expose your systems to known vulnerabilities. We strongly recommend upgrading to a supported version.
What is the latest version of Container-Optimized OS?
The latest version of Container-Optimized OS is cos-125-19216-104-142, released in the cos-125 release cycle.
How many versions of Container-Optimized OS are currently supported?
Container-Optimized OS currently has 4 actively supported version(s): cos-125, cos-121, cos-117, cos-113.
When does Container-Optimized OS cos-125 reach end of life?
Container-Optimized OS cos-125 is scheduled to reach end of life on Sep 1, 2027.
What should I do when Container-Optimized OS reaches end of life?
When a Container-Optimized OS version reaches end of life, you should: 1) Plan your migration to a supported version as soon as possible. 2) Review the release notes for breaking changes. 3) Test your applications thoroughly in a staging environment. 4) Update your dependencies to ensure compatibility with the new version.