This guide will let you know how to upgrade your paraglider in DYING LIGHT 2. You have to follow the simple steps in this guide to do so.
You have to open your game map and find a few parachute icon spots there. You will find the military tech; you need to get to the location from the map, as shown in the image below.
Head to the trader after getting there, and you need to tap over to the upgrade tab from the top of the menu option. After that, go to Nightrunner tools, and you need to have a thousand old-world money to buy it and two military techs for the first upgrade. You will get a blueprint for the second upgrade, as shown in the image below.
Now you need to press S when gliding with enough speed to go higher. You also need to make a check on your stamina to glide safely.