How to update Kali?

To update Kali, first ensure that /etc/apt/sources.list is properly populated:

kali@kali:~$ cat /etc/apt/sources.list
deb http://http.kali.org/kali kali-rolling main contrib non-free
deb-src http://http.kali.org/kali kali-rolling main contrib non-free
kali@kali:~$ 

After that we can run the following commands which will upgrade us to the latest Kali versions:

kali@kali:~$ sudo apt update
kali@kali:~$
kali@kali:~$ sudo apt full-upgrade -y
kali@kali:~$