I've had Global entry for the last 2-3 years and have found if really useful getting through the lines at customs/immigration, but last Sunday while coming back from Grand Cayman I went to use it and if wouldn't take my passport? At that point I remembered that I had renewed my passport in Jan. 2019 and I had just assumed that the Global Entry folks would be automatically notified, Not So!
You have to go to the Global Entry website and create a "Traveler's Account" which requires the nine digit number on the upper left hand corner of the back of your Global Entry Card. Once you have the account created on the right hand side of the dashboard there is a place for updating your passport information.
Hopefully this will help someone else avoid having to endure the long customs/immigration line upon returning to America. (Atlanta only had two agents checking people through even though the lines were clear back to the hall ways leading in to the area)