Authorities in Gabon say voters have overwhelmingly approved a new constitution more than one year after mutinous soldiers overthrew the country’s longtime president and seized power in the oil-rich Central African nation.

The constitutional change would also require presidential candidates to be exclusively Gabonese, with at least one Gabon- born parent and have a Gabonese spouse. The criterion disqualifies ousted ruler Ali Bongo Ondimba,

Gabon held a referendum on a new constitution on Saturday, a major step towards establishing democratic rule after a coup ousted the Bongo dynasty last year, but some observers fear that the ruling junta may use the process to remain in power.