Basemap not up to date

Hi, I've found that the basemap I'm getting (World_Imagery) is not the most up to date version. I only noticed because myself and someone else on a different computer exported the same mapdocument and the image in theirs was more up to date than mine. I've tried the repair option in application maintenance and restarting computer, but no change, and no idea what else to try! Anyone had similar problem?

Thanks