The easiest, cleanest, and long-term solution is to re-image your microSD card with latest Piaware SD card image.
Even if you succeed to upgrade piaware and dump1090-fa in current install, your distro will remain outdated Raspbian Stretch.
The current Piaware SD card image (v 3.8.1) has:
- Latest OS (Raspbian Buster Lite)
- Latest versions of piaware & dump1090-fa (3.8.1)
Direct dwnload link (current image 3.8.1)
http://piaware.flightcdn.com/piaware-sd-card-3.8.1.img.zip
Download page:
https://flightaware.com/adsb/piaware/build
ALTERNATIVELY if you want to use Raspbian image, download it from https://www.raspberrypi.org/downloads/raspbian/, reimage your microSD card with it and install piaware and dump1090-fa latest versions from this page: