Cal. Elec. Code § 19291

If a remote accessible vote by mail system has been certified or conditionally approved by the Secretary of State, it shall not be changed or modified until the Secretary of State has been notified in writing and has determined that the change or modification does not impair its accuracy and efficiency sufficient to require a reexamination and recertification or reapproval pursuant to this chapter. The Secretary of State may adopt rules and regulations governing the procedures to be followed in making his or her determination as to whether the change or modification impairs accuracy or efficiency.