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Have you tried this method? https://rancher.com/docs/k3s/latest/en/upgrades/basic/

Also look at the K3s upgrade controller. It can do a rolling update to nodes in the cluster. It's not perfect, but I've used it for 1.22, 1.23. and will be doing 1.24 this week with it. https://github.com/rancher/system-upgrade-controller

Hey @refined-toddler-64572 what challenges have you faced with the upgrade controller?

The none standard way the controller handled CRDs didn't play nice with gitops methods. Several issues have been opened on it. Here's one: https://github.com/rancher/system-upgrade-controller/issues/172