Technically...you do need a higher voltage. The lightning bolt indicates that the "5v" plane is at 4.63v or less. However, going for a higher voltage PSU is NOT the answer. There are a number problems that can result in an undervoltage condition.
The PSU may not maintain proper voltage under load, especially load near its current rating. Answer: Get a PSU with a higher current rating so you're not runing it near its limit, or get a better PSU, one that can deliver its full rated current without having the voltage drop.
The cable from the PSU to the Pi may not be able to carry the full current without the internal resistance dragging the voltage down. Answer: Get a shorter and/or thicker power cable.
Too much current draw from connected devices. The Pi has current limiting protections. A Pi3B can not draw more than 2.4A. Of that, 1.2A is available for attached USB devices. Answer: Use a powered hub for at least some USB devices.