In addition to iOS 8.4.1, Apple on Thursday also seeded OS X Yosemite 10.10.5, a free update for Macs. The release comes after two developer betas and a month of testing, and you can find it in the Updates tab of the Mac App Store.
Most notably, the update features a patch for the DYLD privilege escalation bug that was discovered earlier this month. Apple says in the release notes that the software includes fixes for both Mail and Photos apps, as well as QuickTime.