Ruby Gems System Update Error

I’ve got an old version of rubygems on my server and so I went to update
it but I get a very unhelpful error message (‘Killed’) - any clues?

~ :
… gem -v
0.9.0
~ :
… gem update --system
Updating RubyGems…
Bulk updating Gem source index for: http://gems.rubyforge.org
Killed

Two shots in the blue:

  1. Maybe a permissions problem. Did you run it as root?

  2. I think gem update --system doesn’t work between all rubygems
    versions.
    Try to download and install from the tarball.