Those of you still on Solaris 10 may want to download the latest Recommended Patchset for Solaris 10 which was published just last week, on 28th of January 2016.
There’s only four such patchsets a year and this is quite handy for rolling baselines when you plan to patch all of your Solaris 10 servers in a particular quarter.
While this patchset does not incluse ALL of the available security patches, it contains most critical ones to date.
From the README:
The Recommended OS Patchset Solaris 10 SPARC provides the minimum set of patches needed to address security and Sun Alert issues, and selected issues identified by Oracle Proactive Services and the Oracle Technical Support Center, for the Solaris 10 Operating System for sparc. The patches contained in this patchset are considered the most important and highly recommended patches for Solaris 10.