v8d was released on 2012-01-15 while v9d (current) was released on 2020-01-12. The version in ports is vulnerable to at least CVE-2020-14152 and CVE-2020-14153.
If you plan to update also add USES=cpe with CPE_VENDOR=ijg CPE_PRODUCT=libjpeg. Alternatively, there's no reason to keep this port after ports r397084 with review D18724 partially confirimng lack of interest.
A commit references this bug:
Date: Mon Oct 26 20:21:06 UTC 2020
New revision: 553383
graphics/jpeg was deprecated.