After the honeymoon: Rent increase?

Rules on adding new tenant to lease

Q: I have lived by myself in an apartment for the last 12 years. I am planning to get married in the fall and I am in the middle of a 12-month lease where I am the only authorized tenant. The lease is actually quite favorable, as I renewed it last December when the landlord was offering a great incentive for lease renewals.

My concern is that if my wife moves in with me, the landlord might consider me to be in violation of my lease and could renegotiate to the much higher rental rate that new incoming tenants are now paying for a comparable apartment. What can I do to maintain my current favorable lease terms if my wife moves in with me?