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The latest released is from branch

release-v2.6

(https://github.com/rancher/kontainer-driver-metadata/blob/release-v2.6/rke/k8s_rke_system_images.go) and is published at https://releases.rancher.com/kontainer-driver-metadata/release-v2.6/data.json. The latest in development is the one that you linked.