The U.S. Citizenship and Immigration Services has updated

Form I-9, effective January 31, 2020. The new form contains clarifications related to authorized representatives and acceptable documents, as well as updates to contact information, the process for requesting paper forms, and the DHS Privacy Notice. As with the W-4, you do not need to use the new form for existing employees, but you must use it for employees hired after January 31, 2020, and when making any adjustments.