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

### Active Milestones

| OS version | Image project | x86 image family | Arm image family | Built by | End of support | Release notes |
|---|---|---|---|---|---|---|
| COS 138 DEV | `cos-cloud` | `cos-dev` | `cos-arm64-dev` | Google | To Be Defined | [dev](https://docs.cloud.google.com/container-optimized-os/docs/release-notes/dev) |
| COS 133 LTS | `cos-cloud` | `cos-133-lts` | `cos-arm64-133-lts` | Google | Nov 2028 | [milestone 133](https://docs.cloud.google.com/container-optimized-os/docs/release-notes/m133) |
| COS 129 LTS | `cos-cloud` | `cos-129-lts` | `cos-arm64-129-lts` | Google | July 2028 | [milestone 129](https://docs.cloud.google.com/container-optimized-os/docs/release-notes/m129) |
| COS 125 LTS | `cos-cloud` | `cos-125-lts` | `cos-arm64-125-lts` | Google | Feb 2028 | [milestone 125](https://docs.cloud.google.com/container-optimized-os/docs/release-notes/m125) |
| COS 121 LTS | `cos-cloud` | `cos-121-lts` | `cos-arm64-121-lts` | Google | March 2027 | [milestone 121](https://docs.cloud.google.com/container-optimized-os/docs/release-notes/m121) |

### Deprecated Milestones

| OS version | Image project | x86 image family | Arm image family | Built by | Deprecation date | Release notes |
|---|---|---|---|---|---|---|
| COS 117 LTS | `cos-cloud` | `cos-117-lts` | `cos-arm64-117-lts` | Google | Sept 2026 | [milestone 117](https://docs.cloud.google.com/container-optimized-os/docs/release-notes/m117) |
| COS 113 LTS | `cos-cloud` | `cos-113-lts` | `cos-arm64-113-lts` | Google | March 2026 | [milestone 113](https://docs.cloud.google.com/container-optimized-os/docs/release-notes/m113) |
| COS 109 LTS | `cos-cloud` | `cos-109-lts` | `cos-arm64-109-lts` | Google | Sept 2025 | [milestone 109](https://docs.cloud.google.com/container-optimized-os/docs/release-notes/m109) |
| COS 105 LTS | `cos-cloud` | `cos-105-lts` | `cos-arm64-105-lts` | Google | March 2025 | [milestone 105](https://docs.cloud.google.com/container-optimized-os/docs/release-notes/m105) |
| COS 101 LTS | `cos-cloud` | `cos-101-lts` | `N/A` | Google | Oct 2024 | [milestone 101](https://docs.cloud.google.com/container-optimized-os/docs/release-notes/m101) |
| COS 97 LTS | `cos-cloud` | `cos-97-lts` | `N/A` | Google | April 2024 | [milestone 97](https://docs.cloud.google.com/container-optimized-os/docs/release-notes/m97) |
| COS 93 LTS | `cos-cloud` | `cos-93-lts` | `N/A` | Google | October 2023 | [milestone 93](https://docs.cloud.google.com/container-optimized-os/docs/release-notes/m93) |
| COS 89 LTS | `cos-cloud` | `cos-89-lts` | `N/A` | Google | March 2023 | [milestone 89](https://docs.cloud.google.com/container-optimized-os/docs/release-notes/m89) |
| COS 85 LTS | `cos-cloud` | `cos-85-lts` | `N/A` | Google | September 2022 | [milestone 85](https://docs.cloud.google.com/container-optimized-os/docs/release-notes/m85) |
| COS 81 LTS | `cos-cloud` | `cos-81-lts` | `N/A` | Google | September 2021^[1](https://docs.cloud.google.com/container-optimized-os/docs/release-notes#fn1)^ | [milestone 81](https://docs.cloud.google.com/container-optimized-os/docs/release-notes/m81) |
| COS 77 LTS | `cos-cloud` | `cos-77-lts` | `N/A` | Google | April 2021^[1](https://docs.cloud.google.com/container-optimized-os/docs/release-notes#fn1)^ | [milestone 77](https://docs.cloud.google.com/container-optimized-os/docs/release-notes/m77) |
| COS 73 LTS | `cos-cloud` | `cos-73-lts` | `N/A` | Google | June 2020 | [milestone 73](https://docs.cloud.google.com/container-optimized-os/docs/release-notes/m73) |
| COS 69 LTS | `cos-cloud` | `cos-69-lts` | `N/A` | Google | December 2019 | [milestone 69](https://docs.cloud.google.com/container-optimized-os/docs/release-notes/m69) |

### Development Release Notes

For release notes related to the milestone under development, see the [Development Release Notes](https://docs.cloud.google.com/container-optimized-os/docs/release-notes/dev) page. For release notes related to cos-dev before M93, see the [Legacy Release Notes](https://docs.cloud.google.com/container-optimized-os/docs/legacy-release-notes) page.

> [!NOTE]
> **Note:** Kubernetes version provided in the changelog corresponds to the Kubelet and the Kubectl version that are shipped in that Container-Optimized OS image. Also, these component version may not be used when running a GKE cluster using a Container-Optimized OS image.


You can see the latest product updates for all of Google Cloud on the
[Google Cloud](https://docs.cloud.google.com/release-notes) page, browse and filter all release notes in the
[Google Cloud console](https://console.cloud.google.com/release-notes),
or programmatically access release notes in
[BigQuery](https://console.cloud.google.com/bigquery?p=bigquery-public-data&d=google_cloud_release_notes&t=release_notes&page=table).

To get the latest product updates delivered to you, add the URL of this page to your
[feed
reader](https://wikipedia.org/wiki/Comparison_of_feed_aggregators), or add the
[feed URL](https://docs.cloud.google.com/feeds/cos-release-notes.xml) directly.