Roth contribution limits and exceeding the allowable earnings

My wife contributes to a Roth IRA monthly.  $125 each month ($1500 annually).  My work is shutting down and I expect to get a significant severance payment when it closes ($220K before withholding).  That will move us from $235K gross earnings to $456K.  That exceeds the allowable for Roth IRA contribution.  What do we do once we know when the severance will occur.  Not sure if late this tax year or next year.