libpcre3 security update on lenny not installed

[Jörg-Volker Peetz <jvpeetz@web.de>]

As far as I know there is a security update available for the package libpcre3
currently installed in lenny. But on my system the security update is not
installed commanding
  aptitude full-upgrade
Checking with
  apt-cache policy libpcre3
shows

libpcre3:
  Installed: 7.4-1
  Candidate: 7.4-1
  Version table:
     7.6-2 0
        500 ftp://ftp.de.debian.org unstable/main Packages
 *** 7.4-1 0
        600 ftp://ftp.de.debian.org testing/main Packages
        100 /var/lib/dpkg/status
     6.7+7.4-2+lenny1 0
        600 http://security.debian.org testing/updates/main Packages

So there is something wrong with the version numbering or what?
-- 
Regards,
Jörg-Volker.