Article XVI. Amendments and Periodic Review

1. Each State Party shall have the right to propose amendments to this Treaty. The text of each proposed amendment shall be submitted to either Depositary, which shall circulate it to all States Parties for consideration. If so requested by no less than three States Parties within a period of 90 days after circulation of the proposed amendment, the Depositaries shall convene a conference of the States Parties to consider the proposed amendment. Such a conference shall open no earlier than 30 days and no later than 60 days after receipt of the third of such requests.

2. An amendment to this Treaty shall be subject to the approval of all States Parties, either by providing notification, in writing, of their approval to a Depositary within a period of 90 days after circulation of the proposed amendment, or by expressing their approval at a conference convened in accordance with paragraph 1 of this Article. An amendment so approved shall be subject to ratification in accordance with the provisions of Article XVII, paragraph 1, and shall enter into force 60 days after the deposit of instruments of ratification by the States Parties.