就在推送 iOS 8.4 正式版的同时，苹果也发布了 OS X 10.10.4 正式版，主要的问题修复和问题改善基本和此前测试版中的一致，现在普通用户也能下载使用了。据更新清单显示，此次 OS X 10.10.4 提高了网络连接的可靠性，主要的途径就是移除 Discoveryd 进程，并重新启用 mDNSresponder 进程，这意味着 Discoveryd 所带来的 WiFi 断线、CPU 占用过高、休眠中唤醒速度慢等问题在正式版中不会再出现了。

除此之外，OS X 10.10.4 正式版还提升了“照片”应用的多项体验，同时还解决了“邮件”发送电子邮件延迟的问题，其它更多方面的更新可以在下图中查看。

从 4 月中第一个测试版到如今的正式版，OS X 10.10.4 历经了两个月的测试时间，相信现在已经是相当优化的版本了，有需要的用户可以通过 Mac App Store 升级。

The OS X Yosemite v10.10.4 update improves the stability, compatibility, and security of your Mac.This update:

- Improves networking reliability

- Improves Migration Assistant reliability

- Addresses an issue that prevented some external displays from functioning properly

- Improves the reliability of upgrading iPhoto and Aperture libraries to Photos

- Improves reliability when syncing photos and videos to iCloud Photo Library

- Addresses an issue that could cause Photos to unexpectedly quit after importing some Lecia DNG files

- Resolves an issue that could delay outgoing email messages in Mail

- Fixes an issue where a website could prevent the user from navigating away by presenting repeated JavaScript alerts in Safari