The Department of Homeland Security (DHS) is adjusting the fee schedule for U.S. Citizenship and Immigration Services (USCIS). … This rule is effective November 23, 2010. Applications or petitions mailed, postmarked, or otherwise filed on or after November 23, 2010 must include the new fee.”
Source: Federal Register / Vol. 75, No. 185 / Friday, September 24, 2010.