Apple Releases Mac Security Update 2019-004 for Sierra and High Sierra [Update]
Apple released Security Update 2019-004 (Sierra) and Security Update 2019-004 (High Sierra) on Monday. Both updates contain security patches also found in macOS Mojave 10.14.6.
[Update: Links to Sierra download updated.]
![Both updates contain security patches also found in macOS Mojave Apple Releases Mac Security Update 2019-004 for Sierra and High Sierra [Update]](https://www.macobserver.com/wp-content/uploads/2017/06/macos-high-sierra-imac.jpg)
macOS High Sierra
Patch Notes for Security Update 2019-004 (Sierra)
Security Update 2019-004 is recommended for all users and improves the security of macOS. For more information on the security content of this update see: http://support.apple.com/kb/HT201222
Security Update 2019-004 (Sierra) is a 927.6MB download. You can also install it through Software Update on your Mac running Sierra.
Patch Notes for Security Update 2019-004 (High Sierra)
Security Update 2019-004 is recommended for all users and improves the security of macOS. For more information on the security content of this update see: http://support.apple.com/kb/HT201222
Security Update 2019-004 (High Sierra) is a 1.9GB download. You can also install it through Software Update on your Mac running Sierra.
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