[ovirt-users] Can't to update cluster to 4.5

I have a message: "Data Center Default compatibility version is 4.4, which is lower than latest available version 4.5. Please upgrade your Data Center to latest version to successfully finish upgrade of your setup". When I try to update datacenter Default I got an error: Error while executing action: Cannot update Data Center compatibility version to a value that is greater than its cluster's version. The following clusters should be upgraded: Default. Next step for me is to try to upgrade compatibility of Cluster. But I have tried to do this by editing Cluster compatibility version from 4.4 to 4.5, but got an error: Error while executing action: Cannot change Cluster Compatibility Version to higher version when there are active Hosts with lower version. Please, give me some advices how to fix problem.