Listed rent price too low, can I raise it?

I couldn't find any comps for the rent I was asking. I made it $150 more than the comparable property I have rented right around the corner. That was $1000. I listed it on Zillow and was overwhelmed by the response. I just went to the comp part of my Zillow listing, and it has it as worth $1300 per month. Can I just change my asking price? Even with the people that I've received applications from? 

Thanks

JOHN