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21 September 2026
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Catalyst Cloud Kubernetes Service
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We have released an update for the API service of CCKS with two notable changes:

* The `Kubernetes Version Skew Policy`_ is now enforced properly during upgrades. Worker nodegroup
  upgrades will be delayed until all control plane nodes are upgraded and active. Previously, all
  nodegroups were upgraded simultaneously.
* Creating new clusters from, or upgrading existing clusters to, cluster templates v1.31 and older
  is no longer possible. Incompatible cluster templates including ``kubernetes-v1.31.14-20251130``
  and older are scheduled for removal after being unsupported since November 2025 or earlier.
  Existing clusters on affected versions can no longer be upgraded. Users of these clusters seeking
  an upgrade path are required to migrate to a newly built cluster on a supported version.

.. _`Kubernetes Version Skew Policy`: https://kubernetes.io/releases/version-skew-policy