newbie q: updating from ruby 1.8 to ruby 1.9

I have ruby 1.8.6 installed and just did an install of Ruby 1.9. ruby -v still shows 1.8 as active though. I had thought maybe to find a symlinkn in /usr/local/bin that pointed ruby to 1.8 vs 1.9 but i didn't. How can I get rid of 1.8 or make 1.9 the default?
 
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