urpmi.update -a

# urpmi.update -a システムのデータベースを最新のものへ更新する
# urpmi --update --auto-select すべてのパッケージをアップデートする

※参考にしました。
http://www12.atwiki.jp/linux2ch/pages/67.html

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[root@localhost ma]# urpmi.update -a
perl: warning: Setting locale failed.
perl: warning: Please check that your locale settings:
LANGUAGE = (unset),
LC_ALL = (unset),
LC_SOURCED = "1",
LANG = "zh_CN.utf8"
are supported and installed on your system.
perl: warning: Falling back to the standard locale ("C").
medium "Core Release" is up-to-date
medium "Core Updates" is up-to-date
medium "Core 32bit Release" is up-to-date
medium "Core 32bit Updates" is up-to-date
[root@localhost ma]# urpmi --update --auto-select
perl: warning: Setting locale failed.
perl: warning: Please check that your locale settings:
LANGUAGE = (unset),
LC_ALL = (unset),
LC_SOURCED = "1",
LANG = "zh_CN.utf8"
are supported and installed on your system.
perl: warning: Falling back to the standard locale ("C").
Packages are up to date