To upgrade a Hyper-V Agent, first upgrade the Management service, and then upgrade all Host services in the Hyper-V environment. See Upgrade the Hyper-V Agent Management service and Upgrade the Hyper-V Agent Host service.
Note: All services must be upgraded to the same version. Earlier service versions cannot be used with later service versions.
You can also move to a new Agent version when recovering a protected Hyper-V environment after a disaster or when migrating VMs to a new environment. See Upgrade the Hyper-V Agent in a new environment.