> ## Documentation Index
> Fetch the complete documentation index at: https://docs.coreweave.com/llms.txt
> Use this file to discover all available pages before exploring further.

# July 31, 2025 - CKS Kubernetes upgrade support

> CKS now supports Kubernetes upgrades with updated control group defaults

CKS now supports Kubernetes upgrades with updated control group defaults.

## Version sequence

* Clusters can only be upgraded to the next Kubernetes minor version (for example, from `1.32` to `1.33`).
* All upgrades must be sequential - if newer versions exist, you must upgrade one version at a time. You cannot skip versions.
* Downgrades are not supported once an upgrade has been performed.

## Eligibility

A cluster is **not** eligible for an upgrade if:

* **The configuration is not supported**: Some clusters do not support self-service upgrades when internal components are out of date or not enabled.
* **The cluster uses deprecated Kubernetes APIs**: If a cluster uses Kubernetes APIs that are deprecated in the target version, the upgrade cannot proceed.

<Note>
  CoreWeave checks for deprecated APIs in your cluster, but cannot guarantee that all deprecated APIs in use are detected. Before upgrading, review the [Kubernetes release notes](https://kubernetes.io/releases/) for your target version and ensure that your workloads are compatible.
</Note>

* **The cluster is not healthy**: Upgrades require the cluster to be in a healthy state.
* **The Nodes are out of date**: If any Nodes are more than two versions behind the Control Plane, the upgrade cannot proceed until [those Nodes are rebooted](/products/cks/clusters/upgrade-kubernetes#step-2-reboot-the-nodes), causing them to upgrade to the latest kubelet version.

## Upgrade process

For detailed instructions on upgrading your cluster, see [Upgrade Kubernetes](/products/cks/clusters/upgrade-kubernetes).