CCE has passed the Certified Kubernetes Conformance Program and is a certified Kubernetes offering. To enable interoperability from one Kubernetes installation to the next, you must upgrade your Kubernetes clusters before the maintenance period ends.

After the latest Kubernetes version is released, CCE will provide you the changes in this version. For details, see Table 1.

**Table 1** Cluster version differences
Source Version	Target Version	Description
v1.19	v1.21	Changelog from v1.19 to v1.21 Changelog from v1.20 to v1.21: https://github.com/kubernetes/kubernetes/blob/master/CHANGELOG/CHANGELOG-1.21.md Changelog from v1.19 to v1.20: https://github.com/kubernetes/kubernetes/blob/master/CHANGELOG/CHANGELOG-1.20.md
v1.17	v1.19	Changelog from v1.17 to v1.19 Changelog from v1.18 to v1.19: https://github.com/kubernetes/kubernetes/blob/master/CHANGELOG/CHANGELOG-1.19.md Changelog from v1.17 to v1.18: https://github.com/kubernetes/kubernetes/blob/master/CHANGELOG/CHANGELOG-1.18.md
v1.15	v1.17	Changelog from v1.15 to v1.17 Changelog from v1.16 to v1.17: https://github.com/kubernetes/kubernetes/blob/master/CHANGELOG/CHANGELOG-1.17.md Changelog from v1.15 to v1.16: https://github.com/kubernetes/kubernetes/blob/master/CHANGELOG/CHANGELOG-1.16.md
v1.13	v1.15	Changelog from v1.13 to v1.15 Changelog from v1.14 to v1.15: https://github.com/kubernetes/kubernetes/blob/master/CHANGELOG/CHANGELOG-1.15.md Changelog from v1.13 to v1.14: https://github.com/kubernetes/kubernetes/blob/master/CHANGELOG/CHANGELOG-1.14.md After a cluster is upgraded from v1.13 to v1.15, the FlexVolume plug-in (storage-driver) is taken over by the CSI plug-in (everest v1.1.6 or later) for container storage. This takeover brings in no function changes, however, you are advised not to create FlexVolume storage resources any more, which will not work in the cluster.

CCE Kubernetes Release Notes