Article 135 Political Constitution of the United Mexican States
Eighth Title. On the Amendments to the Constitution
Current text · last reform published in the Official Gazette of the Federation (DOF) on 2 June 2026
The present Constitution may be added to or amended. In order that the additions or amendments become part of it, it is required that the Congress of the Union, by the vote of two thirds of the individuals present, agree to the amendments or additions, and that these be approved by the majority of the legislatures of the States and of Mexico City.
The Congress of the Union or the Permanent Commission, as the case may be, shall make the count of the votes of the Legislatures and the declaration that the additions or amendments have been approved.