Once the lease is up, he can charge whatever rent he wants. It is his property. That is the problem with renting. Someone else determines your destiny and it costs more. You can try to buy, otherwise, you will have to find something else fast.
But the question is do you have a lease or not. Don't make him evict. Just leave. It will go on your record and you will not be able to rent again.
If you are at the end of a lease or month to month, his reasoning is probably not important. I've attached a link to the State Landlord Tenant Law so you can make sure your rights are being protected, but the owner has rights too.
I don't know if they are following the proper procedures, but it sounds like its time to find another place to live. Start looking immediately and see what you can find.