54 6. The Conference of the States Parties shall adopt an amendment by a two- thirds majority vote of all States Parties which have ratified this Convention. Such an amendment shall enter into force for the States Parties which have expressed their consent to apply the amendment thirty days after the day of the adoption of the amendment. 7. After an amendment has entered into force in accordance with the provisions of this Article, and any State Party has sent the Secretary-General a notification of its objection to the amendment, such an amendment shall enter into force for the respective State Party thirty days after the day it notifies the Secretary-General of the adoption of the amendment. Article 71. Denunciation 1. A State Party may denounce this Convention by written notification to the Secretary-General of the United Nations. Such denunciation shall become effective one year after the date of receipt of the notification by the SecretaryGeneral. 2. A regional economic integration organization shall cease to be a Party to this Convention when all States participating in such organization have denounced this Convention. Article 72. Depositary and languages 1. The Secretary-General of the United Nations shall be designated depositary of this Convention. 2. The original of this Convention, of which the Arabic, Chinese, English, French, Russian and Spanish texts are equally authentic, shall be deposited with the Secretary-General of the United Nations. IN WITNESS WHEREOF, the undersigned plenipotentiaries, being duly authorized thereto by their respective Governments, have signed this Convention.