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1. Any State Party may propose an amendment to this Convention by submitting it to the Secretary-General of the United Nations. The Secretary-General shall thereupon communicate the proposed amendment to the States Parties with a request that they indicate whether they favour a conference of States Parties for the purpose of considering and voting upon the proposal. In the event that within 120 days from the date of such communication at least one third of the States Parties favour such a conference, the Secretary-General shall convene the conference under the auspices of the United Nations.
2. The conference of States Parties shall make every effort to achieve consensus on each amendment. If all efforts at consensus are exhausted and no consensus is reached, the amendment shall, as a last resort, require for its adoption a two-thirds majority vote of the States Parties present and voting at the conference. For the purposes of this paragraph, the vote of a regional economic integration organization shall not be counted.
3. An adopted amendment shall be submitted by the depositary to all States Parties for ratification, acceptance or approval.
4. An adopted amendment shall enter into force 180 days after the date of deposit of the third instrument of ratification, acceptance or approval. When an amendment enters into force, it shall be binding on those States Parties that have expressed consent to be bound by it.
5. When a State Party ratifies, accepts or approves an amendment following the deposit of the third instrument of ratification, acceptance or approval, the amendment shall enter into force in respect of that State Party 180 days after the date of the deposit of its instrument of ratification, acceptance or approval.