Not as simple as you would think.
Arc Fault Protection; In most areas of a house the National Electrical Code requires, when changing out even one plug, for it to be Arc Fault protected. This is allowed be done with a special plug (if there is room in the electrical box) or at the breaker (if there is space in the panel, etc.).
But there is a way to change out a plug or plugs, it might be more work than you had thought. Changing out plugs, when and how to add Arc Fault protection is important. Check with a qualified electrician, electrical contractor.