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# Upgrading EKS

## Prerequisites for the EKS Upgrade

This procedure will upgrade the existing control plane and worker nodes from their present Kubernetes version to a currently supported version of EKS. As the EKS version can be upgraded only one version number at a time, you must repeat this procedure for each incremental version until the cluster is at the required version.

During each stage of the upgrade, system replaces the worker nodes one at a time with the newer EKS version, so as to avoid data loss or excessive cluster downtime.

Next Step: Determine EKS AMIs