Artikel 11

1. In the case of a proposal received from the Standing Committee for the amendment of the Articles to the Convention, or in the case of a proposal for amendment of the Convention received from a Contracting State, the depositary shall submit such proposals for acceptance to all Contracting States.
2. If within three months from the date of the submission of a proposal for amendment under paragraph 1 a Contracting State requests that negotiations be opened on the proposal, the depositary shall arrange for such negotiations to be held.
3. Provided it is accepted by all Contracting States, an amendment to this Convention shall enter into force one month after deposit of the last instrument of acceptance unless another date is provided for in the amendment. Instruments of acceptance shall be deposited with the depositary which shall notify all Contracting States.
4. In the case of a proposal made by the Standing Committee for amendment of the Annexes to the Convention, the depositary shall notify all Contracting States,
5. The amendment to the Annexes shall come into force six months after the date of notification by the depositary unless an objection has been received from the Government of a Contracting State or unless a later date for its entry into force has been provided for in the amendment.