20/09/2018
ISO 45001 is the replacement to OHSAS 18001 and is the international ISO standard for Occupational Health and Safety Management Systems (OHSMS).
Not only will the standard supercede OHSAS 18001, it will make integration with other management systems simpler than ever before; because it shares the new common structure defined by Annex SL, it is directly aligned with the 2015 versions of ISO 9001 and ISO 14001.
If you have certification to OHSAS 18001 you will need to migrate to ISO 45001 to maintain the validity of certification.