Rust stole its koolaid.

github? They recently reset their keys. You may need to update multiple "known hosts" as there can be multiple entries in your ~/.ssh/known_hosts file for them as there are multiple IPs they use and you won't consistently get the same ones, which could lead to the behavior you see.

• https://github.blog/2023-03-23-we-updated-our-rsa-ssh-host-key/
• https://docs.github.com/en/authentication/keeping-your-account-and-data-secure/about-githubs-ip-addresses