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

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cat /etc/apt/sources.list

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# See https://www.kali.org/docs/general-use/kali-linux-sources-list-repositories/
deb http://http.kali.org/kali kali-rolling main contrib non-free non-free-firmware
# Additional line for source packages
# deb-src http://http.kali.org/kali kali-rolling main contrib non-free non-free-firmware

After that you can run the following commands which will upgrade to the latest Kali version:

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sudo apt update

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sudo apt full-upgrade -y