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I have a Windows 7 64-bit computer with ruby 1.8.7 installed and want to update to 1.9.2. I installed 1.8.7 by downlooading and runing Ruby Installer . How do I update to ruby 1.9.2 so ruby 1.9.2 replaces 1.8.7 so that there are not two versions of ruby on my computer?

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  • rename c:\ruby
  • Install latest version of ruby
  • Overwrite C:\ruby\lib\ruby\gems
  • 'gem update' (at your command line) to update your gems.
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Use https://github.com/vertiginous/pik/ to manage multiple versions of ruby on windows.

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I don't want multiple versions of ruby just one. I want ruby 1.9.2 to replace 1.8.7 so I only have 1.9.2 on my windows machine. – Ben Mar 27 '11 at 19:19
Having multiple versions isn't required with pik, it just makes it easier to manage ruby versions (even if you just have one version installed). If you don't want to use pik, uninstall 1.8.7 and use rubyinstaller.org to install 1.9.2 – Christopher Manning Mar 27 '11 at 20:00
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