Clarification on renewal of rent agreement due to change of owner

I have been staying at a rented place since June 2017 and now my landlord sold the property to someone else without much notification.The old landlord had told us there won't be any trouble arising due to change in ownership.Now the new landlord says that the old agreement is void and to make a new agreement he wants an increase in rent or else he wants us to vacate us in two months.Can he actually say something like this? Please advise.