Secure backwards compatible orchestration of isolated guests is disclosed. For example, a current version of an isolated guest orchestrator instantiates an older version of the isolated guest orchestrator in a host as a dependent compute service. An application programming interface request is received. The application programming interface request is determined to be unsupported by the current version of the isolated guest orchestrator. The application programming interface request is sent to the dependent compute service. The application programming interface request is responded to based on a response from the dependent compute service.