Advertised rent too low

[Jeff Caravalho]

Apparently I advertised my rental too low because I have 80 people interested in 2 days.    I advertised $1700 but I'm at least $50 low for sure, maybe $100 or even $200.  How should I approach this from a legal standpoint?  Can I just update my add (zillow) with the higher price?  Is it ok to have a bidding war for a rental?  Good problem to have, but I'm not sure of the best way to inform everyone that I'm low and need to increase, or if I even need to.  Mostly legal concerns, don't want to be surprised by a "professional" tenant!  Thx for your input.