Chapter 5. Upgrading the Red Hat build of Keycloak Admin Client
Be sure that you upgrade the Red Hat build of Keycloak server before you upgrade the admin-client. Earlier versions of the admin-client might work with later versions of Red Hat build of Keycloak server, but earlier versions of Red Hat build of Keycloak server might not work with later versions of the admin-client. Therefore, use the admin-client version that matches the current Red Hat build of Keycloak server version.