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RKE and RKE2 are very different, so the upgrade experience is also different. RKE2 has its own docs for how to upgrade a cluster: https://docs.rke2.io/upgrade. Make sure if you’re upgrading minor versions, to upgrade between minors one at a time (1.21 --> 1.22 --> 1.23 --> etc). Upgrading your Rancher install should follow the same procedure you’re used to: https://ranchermanager.docs.rancher.com/v2.6/getting-started/installation-and-upgrade/install-upgrade-on-a-kubernetes-cluster/upgrades

Thank you Max, I have few more questions. Might well post it little later