Why can't I change the Opportunity Owner via Workflow of type Field Update?

Hello experts

Our client has this concept of "Renewal", wherein when an Opportunity object's Custom Status is set to "Closed", the Owner of the Opportunity needs to be automatically reassigned to a "Renewal Officer".

When I look at the Workflow tool, it doesn't let me choose the standard field "Owner" for Field Update. Any particular reason why? Can I still do this? Or am I just missing a step?

Thanks