The RYA released the 2023 Portsmouth Yardstick numbers over the weekend. They are now in HalSail.
If you add a boat to a PY class and it is on the RYA's list, its handicap will default to the new value. But the handicaps of existing boats are not updated automatically. To do that go to the Boats menu, Standard handicaps, click to see your PY classes and then Update all.
Alternatively you can update boats individually, either on the Boat-class crosstab page, or by editing each boat's details.