How do I change the managing director of a GmbH?

Every change of managing director must be registered in the Handelsregister, with the appointment or removal documents in original or certified form. The new director also declares that nothing disqualifies them from office. In practice this means a notary appointment, which can often be done by video or at a notary in your country.

Corporate changes

Source: GmbH-Gesetz § 39: Anmeldung der Geschäftsführer, Federal Ministry of Justice, gesetze-im-internet.de