Remote scan with Ed25519 key

I'm trying inspec in these day and I'd like it to work with public key auth. My key has been generated with ed25519 algorith and when I try to run a remote scan inspec returns me this error:

unsupported key type `ssh-ed25519' (NotImplementedError)
net-ssh requires the following gems for ed25519 support:

  • rbnacl (>= 3.2, < 5.0)
  • rbnacl-libsodium, if your system doesn't have libsodium installed.
  • bcrypt_pbkdf (>= 1.0, < 2.0)

I only installed inspec RPM and I don't use chef. How can I install that packages?