Transition from 1 year lease to month to month

[Valerie Zimmerman]

Hello,

We live in the city of Milwaukee, WI.  We are transitioning a tenant from a 1 year lease to a month to month lease.   We are not increasing the rent at this time.  My husband thinks we do not need to have them sign a formal month to month lease, but I prefer to have all steps documented.  Do I need to have the tenant sign a month to month lease?