Oh CentOS why you so annoying! I love you and hate you all at the same time!
When trying to add the shiny Github RSS feed on the right of the page I came up with CS errors that WordPress could not validate the SSL CA. This happens because CentOS had an old certificate authority bundle: /etc/pki/tls/certs/ca-bundle.crt
I found a blog post from last year here and made sense for my position!
Backup your existing file just so you don’t kill any kittens:
cp /etc/pki/tls/certs/ca-bundle.crt /root/kitten-basket
Then use magic to get the new one, I used the one found in the other blog post referenced above.
curl http://curl.haxx.se/ca/cacert.pem -o /etc/pki/tls/certs/ca-bundle.crt
I restarted apache (not sure if I needed to but made sense!) and yippee it works!