[Rails] rails 3 on debian

Rails 3 requires bundler to be installed, but bundler can't be installed
on Debian lenny because the gem version 1.2 is too old, an attempt
update is also failed, any idea?

# gem update --system
ERROR: While executing gem ... (RuntimeError)
gem update --system is disabled on Debian. RubyGems can be updated
using the
official Debian repositories by aptitude or apt-get.
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