Yes, unless they have a lease which is on a month to month basis and the terms restrict this. In 95% of the cases, you can get them into a lease. I would recommend providing some evidence to show what the market rent should be as a reason why the rent is going up.
You should be prepared if in case the tenant walks. If they are a long-term tenant which always pays on time, it may be worth keeping them. A couple of months of the property being empty each year as you turn over tenants can quickly eat up any rent increase.