Download ftp://ftp.ruby-lang.org//pub/ruby/1.9/ruby-1.9.2-p136gz 2. There are so many reasons to upgrade to mac OS Sierra now.
Updating ruby mac os x
You should also have your Apple ID and password handy.
Then, if your Mac is running OS X Lion 10.7.5 or later, you can upgrade directly to mac OS Sierra. Click the download button and follow the onscreen instructions to begin your upgrade.
If you don’t have broadband access, you can upgrade your Mac at any Apple Store.
The Mac App Store shows updates for Mac, not updates for i Phone, i Pad, or i Pod touch.
If you don't have the App Store on your Mac, get OS X updates by choosing Software Update from the Apple () menu.