Long time tenant but it's time for an increase

[Kay Hart]

I have a husband and wife tenant who has been renting for us for over 6 years at the same rent. It is however time for a rent increase.

I know they will not be happy, But rents in our area has skyrocketed and even though I want to be nice to them I have to be fair to me as I know I can get a 50% increase if they were to leave the apartment

Any ideas on how to approach this subject.