PMI requires that all certification credential holders must earn PDUs to maintain their certification.
PDUs are officially known as Professional Development Units . PDUs are one-hour blocks of time learning, teaching others, or volunteering. By accumulating and tracking these over a three-year period, you can maintain your certification status with PMI.
If you have a PMP®, PgMP®, PfMP®, PMI-PBA®, you will need to earn 60 PDUs in a three-year cycle.