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The Department of Homeland Security (DHS) previously invited public comment on an Advance Notice of Proposed Rulemaking (ANPRM) 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. Taking into consideration the comments received, the Cybersecurity and Infrastructure Security Agency (CISA) has determined to limit the scope of this rulemaking to improving Appendix A to the CFATS regulations and address concerns with release-flammable security issues. Additionally, in June 2020, CISA published a notice announcing the availability of a retrospective analysis of the data, assumptions, and methodology that were used to support the 2007 CFATS interim final rule and providing the public an opportunity to provide comment. Once the comment period closes, CISA intends to determine the next appropriate step for this rulemaking.