[Rails] Ruby Problem update

Hello,
I have always worked with ruby 1.8.7 on Linux Oracle from the depository available on the system.
Today , I decide to install the latest version of ruby -->V2.0.0 (from the ruby website).
When I type : ruby -v, I have the result : ruby 1.8.7.
Indeed, my OS doesn't recognize the update.
May somebody help me ?
JR

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