I also wouldn't normally expect a problem here, but this actually happened to me yesterday. Some 3rd-order transitive dependency resulted in trying to download a file from https://rubygems.org, rather than http. Apparently my SSL certs were out of date (on both dev and prod) and so I had to spend a few hours Googling how to make RVM + Ruby Gems update my certs.

It's really easy to write these kinds of things off as rare occurrences, but this is exactly the kind of thing that causes us to talk about "fear" when deploying.

Edit: solution was to run 'rvm osx-ssl-certs update all' on OSX, which is unsettling, as it installs certs all over the disk. Then on Ubuntu it was "yum update openssl", I believe.