Article 138 [Initiative]
The initiative to amend the Constitution shall be vested either with the President of the Republic acting in the Council of Ministers or with the National Assembly upon the proposal of one-third of its members.
Article 139 [Majority]
The bill or proposal for amendment shall be adopted only by a three-fourths majority of the members of the National Assembly and the Senate.
Article 140 [Facultative Referendum]
The President of the Republic acting in the Council of Ministers may submit the amendment to a referendum.
Article 141 [Obligatory Referendum]
The Preamble and Titles I, II, III, and VII may be amended only by means of referendum.
Article 142 [Republic]
The republican form of the State shall not be subject to amendment.