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 129 DEV | cos-cloud |
cos-dev |
cos-arm64-dev |
TBD | dev | |
| COS 125 LTS | cos-cloud |
cos-125-lts |
cos-arm64-125-lts |
Sept 2027 | milestone 125 | |
| COS 121 LTS | cos-cloud |
cos-121-lts |
cos-arm64-121-lts |
March 2027 | milestone 121 | |
| COS 117 LTS | cos-cloud |
cos-117-lts |
cos-arm64-117-lts |
Sept 2026 | milestone 117 | |
| COS 113 LTS | cos-cloud |
cos-113-lts |
cos-arm64-113-lts |
March 2026 | milestone 113 |
Deprecated Milestones
| OS version | Image project | x86 image family | Arm image family | Built by | Deprecation date | Release notes |
|---|---|---|---|---|---|---|
| COS 109 LTS | cos-cloud |
cos-109-lts |
cos-arm64-109-lts |
Sept 2025 | milestone 109 | |
| COS 105 LTS | cos-cloud |
cos-105-lts |
cos-arm64-105-lts |
March 2025 | milestone 105 | |
| COS 101 LTS | cos-cloud |
cos-101-lts |
N/A |
Oct 2024 | milestone 101 | |
| COS 97 LTS | cos-cloud |
cos-97-lts |
N/A |
April 2024 | milestone 97 | |
| COS 93 LTS | cos-cloud |
cos-93-lts |
N/A |
October 2023 | milestone 93 | |
| COS 89 LTS | cos-cloud |
cos-89-lts |
N/A |
March 2023 | milestone 89 | |
| COS 85 LTS | cos-cloud |
cos-85-lts |
N/A |
September 2022 | milestone 85 | |
| COS 81 LTS | cos-cloud |
cos-81-lts |
N/A |
September 20211 | milestone 81 | |
| COS 77 LTS | cos-cloud |
cos-77-lts |
N/A |
April 20211 | milestone 77 | |
| COS 73 LTS | cos-cloud |
cos-73-lts |
N/A |
June 2020 | milestone 73 | |
| COS 69 LTS | cos-cloud |
cos-69-lts |
N/A |
December 2019 | milestone 69 |
-
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
You can see the latest product updates for all of Cloud de Confiance by S3NS on the Cloud de Confiance page, browse and filter all release notes in the Cloud de Confiance console, or programmatically access release notes in BigQuery.
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September 16, 2025
Fixed a kernel bug which caused boot to fail for n4 machine types.
August 18, 2025
Enabled the Btrfs kernel module.
July 30, 2025
Runtime sysctl changes:
- Changed: fs.file-max: 811539 -> 811510
July 28, 2025
Runtime sysctl changes:
- Changed: fs.file-max: 811820 -> 811775
Fixed KCTF-5e28d5a in the Linux kernel.
March 05, 2025
cos-beta-121-18867-0-24
| Kernel | Docker | Containerd | GPU Drivers |
| COS-6.6.74 | v25.0.7 | v2.0.2 | See List |
Upgraded net-misc/openssh to v9.9_p1.
New Features and Changes in the Linux Kernel:
Removed dev-python/jaraco-context.
Upgraded app-admin/fluent-bit to v3.2.5-r1.
Upgraded app-containers/runc to v1.2.4-r1.
Updated sys-fs/xfsprogs to v6.9.0.
Updated net-libs/libtirpc to v1.3.6.
Updated dev-libs/expat to v2.6.4.
Updated sys-apps/gentoo-functions to v1.7.3.
Removed dev-python/zipp.
Updated net-libs/libnetfilter_conntrack to v1.1.0.
Upgraded app-containers/cri-tools to v1.31.1-r1.
Removed support for R550, R560, and R565 Nvidia drivers.
Upgraded app-containers/containerd to v2.0.2-r1.
Updated chromeos-base/crash-reporter to v0.0.1-r4257.
Removed dev-python/wheel.
Removed dev-python/trove-classifiers.
Updated chromeos-base/minijail to v18-r158.
Upgraded app-admin/google-guest-agent to v20250204.02-r1.
Updated dev-libs/nss to v3.107.
Updated chromeos-base/update_engine to v0.0.3-r4806.
Added support for nftables flow offload and the flowtable infrastructure.
Removed dev-python/autocommand.
New Features and Changes in the Image:
Updated chromeos-base/chromeos-common-script to v0.0.1-r656.
Removed dev-go/protobuf.
Upgraded app-containers/docker to v25.0.7.
Removed dev-python/webcolors.
Removed dev-go/appengine.
Removed dev-python/zope-interface.
Removed dev-python/jaraco-text.
Removed dev-python/setuptools.
Upgraded app-admin/google-osconfig-agent to v20250121.00-r1.
Updated dev-db/sqlite to v3.47.2.
Removed chromeos-base/chromeos-ec-headers.
Removed dev-python/importlib_resources.
Updated chromeos-base/power_manager-client to v0.0.1-r2960.
Updated chromeos-base/session_manager-client to v0.0.1-r2816.
Removed dev-python/ordered-set.
Removed dev-go/protobuf-legacy-api.
Removed dev-python/typing-extensions.
Updated sys-libs/libcap to v2.71.
Updated chromeos-base/update_engine-client to v0.0.1-r2469.
Removed dev-python/tomli.
Removed dev-python/setuptools_scm.
Updated app-admin/extensions-manager to v0.0.1-r58.
Removed virtual/libusb.
Removed dev-python/pydantic.
Updates to Major Packages:
Removed the capability to change the kernel's preemption model on the kernel command line.
Removed sys-libs/libselinux.
Updates to Minor Packages:
Removed dev-libs/libusb.
Updated sys-libs/libseccomp to v2.5.5-r2.
Upgraded app-emulation/cloud-init to v24.4.1-r1.
Upgraded app-containers/cni-plugins to v1.6.2-r1.
Removed dev-python/platformdirs.
Removed chromeos-base/libec.
Updated net-dns/c-ares to v1.34.4.
Updated chromeos-base/debugd-client to v0.0.1-r2725.
Removed sys-libs/libsepol.
Updated sys-apps/diffutils to v3.11.
Updated sys-apps/pv to v1.9.27.
Updated app-admin/sudo to v1.9.16_p2-r1.
Updated sys-apps/flashrom to v0.9.9-r1626.
Upgraded app-admin/oslogin to 20241216.00-r1.
Updated dev-go/oauth2 to v0.23.0-r1.
Removed dev-python/jaraco-functools.
Removed dev-python/more-itertools.
Updated dev-python/chardet to v3.0.4-r2.
Removed chromeos-base/dlcservice-client.
Updated chromeos-base/shill-client to v0.0.1-r4812.
Removed dev-libs/confuse.
Removed dev-python/inflect.
Updated net-firewall/iptables to v1.8.10-r3.
Updated net-misc/curl to v8.11.1-r2.
Removed sys-libs/gdbm.
Removed dev-embedded/libftdi.
January 13, 2025
This is an LTS Refresh release.
November 06, 2024
Runtime sysctl changes:
- Changed: fs.file-max: 811796 -> 811757
Upgraded sys-apps/xemu to v0.0.6
October 31, 2024
This is an LTS Refresh release.
October 28, 2024
Runtime sysctl changes:
- Changed: fs.file-max: 811768 -> 811706
October 24, 2024
Upgraded app-containers/containerd to 1.7.23.
October 21, 2024
This is an LTS Refresh release.
This is an LTS Refresh release.
October 14, 2024
Upgraded to v1.16.2. Fixed CVE-2024-0132 and CVE-2024-0133.
October 07, 2024
Upgraded nvidia-container-toolkit to v1.16.2. Fixed CVE-2024-0132 and CVE-2024-0133.
Upgraded to v1.16.2. Fixed CVE-2024-0132 and CVE-2024-0133.
Upgraded to v1.16.2. Fixed CVE-2024-0132 and CVE-2024-0133.
August 12, 2024
This is an LTS Refresh release.
This is an LTS Refresh release.
July 01, 2024
Fixed CVE-2024-6387 in net-misc/openssh.
Fixed CVE-2024-6387 in net-misc/openssh.
Fixed CVE-2024-6387 in net-misc/openssh.
Fixed CVE-2024-6387 in net-misc/openssh.