Dell Vostro 2520 - Dell Wireless 1704 802.11 b/g/n does not support 5G Wireless connection

Hi, I own Dell Vostro 2520 with Dell Wireless 1704 802.11 b/g/n. Recently I upgraded my home wifi to 5G. I am unable to connect my Dell Vostro to Wireless as it does not supports 5G. How can I upgrade my Dell Wireless so that it support 5G Wifi connections? Do I need to change my Network Adapter?