Kubernetes v1.17.17 is now available for Rancher versions v2.3.8+ and v2.4.4+
Kubernetes v1.18.15 is now available for Rancher versions v2.4.5+
Kubernetes v1.19.7 is now available for Rancher versions v2.5.0+
Note: If you are an air gapped user, please review the documentation on how to get these versions