[ovirt-users] oVirt 4.0.0 - Cluster Compatibility Version

Hello list, I've successfully upgraded oVirt to 4.0 from 3.6 on my engine and three hosts. However, it doesn't look like I can change the Cluster Compatibility Version to 4.0. It tells me I need to shut down all the VMs in the cluster. Except I use Hosted Engine. How do I change the cluster compatibility version when the engine is down? Thanks in advance, Scott