The U.S. Air Force recently released a memorandum to inform the GPS community of an update to the GPS ground control software that may impact some user equipment. The U.S. Air Force intends to reinstall the software update no earlier than March 1, 2018 to provide time for manufacturers to bring GPS receivers into compliance with the Interface Specification.
Source: USCG
Link: 1/23/2018: Air Force announces update to GPS ground control software