The organization's internal audit charter was last updated six years ago.

The most appropriate action for the chief audit executive to take when updating the internal audit charter is to perform a review of IIA guidance to become acquainted with the latest mandatory elements prior to updating the charter. This ensures that the charter will be updated according to the most current standards and practices required by the IIA. Staying updated with the latest guidance helps in maintaining compliance with professional standards and aligning the internal audit function's objectives and scope with organizational needs and regulatory expectations.

IIA's International Standards for the Professional Practice of Internal Auditing and guidance on internal audit charters.