When I try to use apt update

Get:1 http://kali.download/kali kali-rolling InRelease [41.5 kB]
Err:1 http://kali.download/kali kali-rolling InRelease
The following signatures couldn't be verified because the public key is not available: NO_PUBKEY ED65462EC8D5E4C5
Warning: GPG error: http://kali.download/kali kali-rolling InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY ED65462EC8D5E4C5
Error: The repository 'http://http.kali.org/kali kali-rolling InRelease' is not signed.
Notice: Updating from such a repository can't be done securely, and is therefore disabled by default.
Notice: See apt-secure(8) manpage for repository creation and user configuration details.
Notice: Repository 'Kali Linux' changed its 'firmware component' value from 'non-free' to 'non-free-firmware'
Notice: More information about this can be found online at: https://www.kali.org/blog/non-free-firmware-transition/

I get this error message when trying update Kali any help will be greatly appreicated.

Thanks