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I have the default Ruby 1.8.7 on 10.7 (Lion), and I'm wondering if Mountain Lion upgrades this to the 1.9.x series.

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up vote 6 down vote accepted

On my 10.8.1 system:

/Volumes/Macintosh HD/Users/ian [ian@Ian-Cs-MacBook-Pro] [15:48]
> which ruby

/Volumes/Macintosh HD/Users/ian [ian@Ian-Cs-MacBook-Pro] [17:49]
> ruby --version
ruby 1.8.7 (2012-02-08 patchlevel 358) [universal-darwin12.0]
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