In 1933, the Apostolic Prefecture of French Guiana was transformed into a vicariate, the Apostolic Prefect became bishop. The church also changes status and becomes cathedral. It is consecrated as a cathedral on 9 November 1934 by Bishop Gourtay, then the first bishop of Guiana. In 1952, it was enlarged, during the work the workers found an inset lead cassette containing 21 coins, the oldest of which dates from Napoleon I and 20 seals from the time of Charles X.