Why the IPFilter version on FreeBSD6.2 is former than the one on FreeBSD6.0 ?

[speedo chen]

Hi all:

 Below links show that

    *IPFilter* has been updated from 3.4.35 to 4.1.18.      On FreeBSD6.0
    *IPFilter* has been updated from 4.1.8 to 4.1.13.        On FreeBSD6.2

http://www.freebsd.org/releases/6.0R/relnotes-i386.html#CONTRIB
http://www.freebsd.org/releases/6.2R/relnotes-i386.html#CONTRIB


    Could someone tell me why the version of IPFilter on FreeBSD6.2 is
former than FreeBSD6.0 ?
    Thanks.


Sincerely,
Y.T.