What to do with Demarco Murray?

I have demarco murray but my other RBs are Thompson and Miller. I really want to upgrade at RB but feel murray does not really have any type of value to upgrade. I have Hill, Green, M. Thomas, Corey Davis and Curtis Samuel at wr. I have ASJ and Hunter Henery at TE. what moves can I make to upgrade my RB so I can get this MUST win this week. Thanks for the help.