See the attached screenshot. I noticed that https://github.com/codinn/SSHKitCore was updated all of 16 days ago (since this post was created).
Can we updated the ciphers ourselves or do we need to wait for a release?
Both chacha20-poly1305@openssh.com and aes256gcm@openssh.com are not supported by SSHKitCore (or libssh) for now.
Is it possible changing your server settings to accept more ciphers? The following ciphers are supported by SSHKitCore: aes256-ctr, aes192-ctr, aes128-ctr, aes256-cbc, aes192-cbc, aes128-cbc, 3des-cbc, blowfish-cbc