I'm on MacOS Ventura 13.0 and I'm trying to upgrade Rubygems.
$ gem update --system
ERROR: While executing gem ... (Gem::RemoteFetcher::FetchError)
Errno::ECONNREFUSED: Failed to open TCP connection to localhost:8808 (Connection refused - connect(2) for "localhost" port 8808) (http://localhost:8808/specs.4.8.gz)
How can I solve the error?