A method of modernizing an elevator door system of an elevator installation wherein a door drive together with a car door/shaft door coupling, which is mounted at a car door in a door opening region thereof, and a shaft door lock, which is mounted at a shaft door in a door opening region of the same, are replaced. A new door drive and a new car door/shaft door coupling are arranged at the car, wherein the fastening points of the new coupling are arranged in the region above the door opening and a new shaft door lock is arranged at the original shaft door in correspondence with the arrangement of the new car door/shaft door coupling above the door opening of the shaft door.
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