Upgrade only mailscanner & SA on Debian with apt-get?

[Rob]

Hello all... Hope your weekends were good...



I want to upgrade to one of the latest Mailscanners and SA... according to my Debian i am running....

Desired=Unknown/Install/Remove/Purge/Hold
| Status=Not/Installed/Config-files/Unpacked/Failed-config/Half-installed
|/ Err?=(none)/Hold/Reinst-required/X=both-problems (Status,Err: uppercase=bad)
||/ Name           Version        Description
+++-==============-==============-============================================
ii  mailscanner    4.41.3-2       email virus scanner and spam tagger
ii  spamassassin                  3.1.0a-1.dirk.31.1            Perl-based spam filter using text analysis
ii  spamc                         3.1.0a-1.dirk.31.1            Client for SpamAssassin spam filtering daemon



How can i upgrade just these packages? 

My applogies if this is off topic a bit....

Thanks and have a  great day!

Rob..
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