ANSI/ESD S20.20 - 2021 is a complimentary download from ESDA.ORG.
Sites will have time to update their ESD control plan if necessary. The timeline is between June 2022 and May 2023, certifications can be done to either the 2014 version or the 2021 version of ANSI/ESD S20.20. After June 1, 2023, all facility certifications will be done to the 2021 version of ANSI/ESD S20.20. There is also a tech talk at https://vimeo.com/560543484/cdd2074dc5 that covers most of the updates to ANSI/ESD S20.20 - 2021.