As a intermediate result of the recent negotiation between 132 UN member states in late march 2017, on May 22 a first draft of the United Nations treaty to prohibit nuclear weapons was released.
This draft will be the basis of further negotiations from June 15 to July 7.
Read the full text of the draft:
Link (via ICAN): http://www.icanw.org/wp-content/uploads/2017/05/BanDraft.pdf?mc_cid=82bc72e11d&mc_eid=0cf7fd88c3
Extensive backgound information on the treaty: http://www.icanw.org/campaign-news/negotiations/