Kali Linux allows you to generate updated ISOs of Kali using Debian live-build scripts on the fly. The easiest way to generate these images is from within a pre existing Kali Linux environment. You will first need to install the live-build and cdebootstrap packages:

kali@kali:~$ sudo apt update
kali@kali:~$ sudo apt install -y git live-build cdebootstrap

Next, we clone the Kali cdimage Git repository as follows:

kali@kali:~$ git clone git://gitlab.com/kalilinux/build-scripts/live-build-config.git

Now you can change to the live directory under cdimage.kali.org and build your ISO:

kali@kali:~$ cd live-build-config/
kali@kali:~$ lb clean --purge
kali@kali:~$ lb config
kali@kali:~$ lb build