And it never moved by a factor of even 0.01? Since they are probably doing some rounding, it never moved by 0.005? Maybe it did and by the time I checked it was back at 4.88.

It's interesting that many people in this thread report 4.88 though. I would assume Uber wants to obfuscate recent ratings (eg if you notice when your rating changed, you might pin point the driver and add a case against them if you 're vengeful enough). Maybe it's similar to the number 300 for youtube (where views stop being counted in realtime and they are being grouped + analyzed). Who knows.