On April 13, 2016, USCIS revised Form N-400, Application for Naturalization. The revised version is available at uscis.gov/n-400. You may continue to use the 9/13/13 edition of the form until August 9, 2016. USCIS will reject and return previous versions of Form N-400 submitted on or after August 10, 2016. Eligibility Requirements: The eligibility requirements for naturalization have not changed. For information on how to complete the form, and where eligibility requirements can be found, visit uscis.gov/n-400. For additional information refer to our Guide to Naturalization.