Sometimes you want one distinct version of RubyGems to be installed to replicate the same behavior across multiple servers.

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Usually would do this to update your RubyGems, but this always takes you to the latest version:

gem update --system

While there are ways around the interwebs that use the rubygems-update package and call its setup.rb, there is an undocumented switch you can use:

gem update --system 1.3.7

This updates to the given version, 1.3.7 in the above case, by walking the rubygems-update package way itself.

Note that if you are trying to avoid API breakage, SlimGems Show archive.org snapshot probably is exactly what you need.