I just discovered I can no longer gem push … any more and some digging led me to a need to update my RVM SSL certs.
I ran rvm osx-ssl-certs status
In my case an update with ReactJS + Node env screwed one rails project and after expending a lot of time either reinstalling ruby version via rbenv (was 2.5.1 BTW) and also reinstall openssl via homebrew, bundler reinstall (none of these worked) a simple
brew update && brew upgrade
did the trick!
was running OSX and mojave