The last PR update to the Google toolbar was in October. Google is not updating the PR in the Google toolbar on a regular basis any more. Some think it will now happen every three months, which would mean we wouldn't see a new update to the PR we see until January.

With that said, the internal "PR" that Google uses (but doesn't display to us) probably gets updated on a regular basis, however, since there is no way for us to see this information, there is no way for us to know what this value is.

In the end it is no use stressing over what your PR appears to be in the Google Toolbar as this is intentionally inaccurate and out of date. If your PR on the Google toolbar is high great, if it appears low, don't stress over it. The only thing this figure effects is your pride, it doesn't impact your performance in Google's SERPs