The Mirantis Container Cloud GA release 2.13.1 is based on 2.13.0 and:
Introduces support for the Cluster release 6.20.0 that is based on the Cluster release 5.20.0 and represents Mirantis OpenStack for Kubernetes (MOS) 21.6. This Cluster release is based on Mirantis Kubernetes Engine 3.3.12 with Kubernetes 1.18 and Mirantis Container Runtime 20.10.6.
Make sure to update the Cluster release version of your managed cluster before the current Cluster release version becomes unsupported by a new Container Cloud release version. Otherwise, Container Cloud stops auto-upgrade and eventually Container Cloud itself becomes unsupported.
For details about the Container Cloud release 2.13.1, refer to its parent release 2.13.0.