Very precise 54V DC power supply

I need to build a very stable DC power supply with a variable output (51 to 56 VDC) at a very low current output ( 100 mA). But the driff and stability needs to be very less than 5 mV. The circuit will not be operating in very significant temperature changes. Which of the many Linear voltage reference should I be considering for this application?

Regards

Santiago Beron