Upgrade failure

I've just upgraded most of the software on my FreeBSD 5.5 computer.
Refdb is now complaining about the main database:

404 >refdbc
Please enter your password:
refdbc: selectdb refs
main database version is not supported
refdbc: quit

Upgrades included:
mysql-client-5.0.24a_1      <  needs updating (port has 5.0.33)
postgresql-client-7.4.13    <  needs updating (port has 7.4.16)
refdb-0.9.6_2               <  needs updating (port has 0.9.8)
sqlite-3.3.7                <  needs updating (port has 3.3.12)

Libdbi is currently:
libdbi-0.8.1_1      Database Independent Abstraction Layer for C
libdbi-drivers-0.8.1_1 Drivers for libdbi

Haven't done any upgrades outside the FreeBSD ports.
Suggestions?

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