[CentOS] Package updates for 5.4?

We're running a large cluster, and are leery of upgrading them all to 5.5,
but would like to find the latest security patches.

Is there a repo for this?  I can't seem to find a 5.4 specific update repo
with anything since last March.  Is 5.4 EOL'd?

Thanks,
  -- Mitch
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