Renewing your PMP certification is crucial as it expires every three years, requiring individuals to demonstrate their continued relevance through Professional Development Units (PDUs). To maintain certification, a minimum of 60 PDUs must be earned, including at least 35% from educational activities, with an application process that includes reaffirming ethical commitments and paying a renewal fee. If certification is not renewed on time, it may be suspended or expire, although there are provisions for those called to active military service or facing involuntary leave.