Help in personal flutter web project

i have a personal project in flutter, this read images, personal info and live location from firebase firestore, i have a map to show all the user locations, this show the map markers when you open the app, but the markers are static(setState function is not refreshing the marker position), and i need to refresh all the marker positions on live(like when you see the uber driver position on the map), if location lat-long of the user change then the map marker must show the new location.