Even though the FAQ entry is dated for June 18 I went ahead and re-updated the base install with
Code:
OpenBSD 5.3-current (RAMDISK_CD) #2: Tue Jun 18 13:44:00 MDT 2013
deraadt@amd64.openbsd.org:/usr/src/sys/arch/amd64/compile/RAMDISK_CD
and the packages then updated fine.