Updating to the most recent dports binaries has some extra steps.
If you have a bulk build of packages happening with dsynth(1), you can now add - literally, that's the command - to the package list without interrupting the build.
Yay, another week that overflowed with links!
If you're moving your dsynth build to a different machine, there's now a 'list-system' directive that lets you recreate the same setup in a new place.