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The Cybersecurity and Infrastructure Security Agency (CISA) previously invited public comment on an Advance Notice of Proposed Rulemaking (ANPRM) during August 2014 for potential revisions to the Chemical Facility Anti-Terrorism Standards (CFATS) regulations. The ANPRM provided an opportunity for the public to provide recommendations for possible program changes. In June 2020, CISA published for public comment a retrospective analysis of the CFATS program. And in January 2021, CISA invited additional public comment through an ANPRM concerning the removal of certain explosive chemicals from CFATS. CISA intends to address many of the subjects raised in both ANPRMs and the retrospective analysis in this regulatory action, including potential updates to CFATS cybersecurity requirements and Appendix A to the CFATS regulations.