Hi, thanks a lot for the comments. Yeah, I know the benefits of the schema-less classad architecture. But you never know if there is something new with the communication channel itself -rather the content-, that requires all daemons to run the same version. Anyways, my main concern is about non-backwards compatibility issues for any of the daemon. But from the comments I feel there is nothing to be worried about between 8.6 and latest. Our configuration is split between condor_config, condor_config.local and config.d/ That should keep working after an upgrade, right?