Composer update error: Installing smatar/laravel-settings (1.3): Downloading (failed). Laravel

I'm having this error when I execute composer update in my laravel project (it's been working for years):

 - Installing smatar/laravel-settings (1.3): Downloading (failed)    Failed to download smatar/laravel-settings from dist: The "https://api.github.com/repos/SMATAR/laravel-settings/zipball/7b76462fe90224688c632d90c5f84a28c0f6e2bc" file could not be downloaded (HTTP/1.1 404 Not Found)
    Now trying to download from source
  - Installing smatar/laravel-settings (1.3): The authenticity of host 'github.com (18.231.5.6)' can't be established.
RSA key fingerprint is SHA256:nThbg6kXUpJWGl7E1IGOCspRomTxdCARLviKw6E5SY8.
Are you sure you want to continue connecting (yes/no)? yes
Cloning 7b76462fe9


  [RuntimeException]
  Failed to clone https://github.com/SMATAR/laravel-settings.git via https, ssh protocols, aborting.
  - https://github.com/SMATAR/laravel-settings.git
    Cloning into '/var/www/html/prod/web/vendor/smatar/laravel-settings'...
    remote: Invalid username or password.
    fatal: Authentication failed for 'https://github.com/SMATAR/laravel-settings.git/'
  - git@github.com:SMATAR/laravel-settings.git
    Cloning into '/var/www/html/prod/web/vendor/smatar/laravel-settings'...
    Warning: Permanently added the RSA host key for IP address '18.228.67.229' to the list of known hosts.
    Permission denied (publickey).
    fatal: Could not read from remote repository.

    Please make sure you have the correct access rights
    and the repository exists.

via Chebli Mohamed