U.S. Citizenship and Immigration Services (USCIS) has published a new I-9, Employment Eligibility Verification form. Until September 17, 2017, employers may continue using Form I-9 with a revision date of 11/14/2016, or use the new revised version. Starting on September 18, 2017, employers must use the revised form with a revision date of 7/17/2017. USCIS has removed the prior version from its website. The only version that is available on the USCIS website is the new I-9 form (7/17/17 version).
Further information on the new edition of the I-9 form from USCIS can be found here: https://www.uscis.gov/i-9-central/whats-new.