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# macOS Catalina 10.15.4 Release Notes

Update your apps to use new features, and test your apps against API changes.

## Discussion

The macOS 10.15.4 SDK provides support to develop apps for Macs running macOS Catalina 10.15.4. The SDK comes bundled with Xcode 11.4, available from the Mac App Store. For information on the compatibility requirements for Xcode 11.4, see <doc://com.apple.documentation/documentation/Xcode-Release-Notes/xcode-11_4-release-notes>.

### Endpoint Security

#### New Features

- Using a custom Mach service name is now supported for `XPC` between apps and extensions. See <doc://com.apple.documentation/documentation/EndpointSecurity> for more information. (57244148)

### Music

#### New Features

- The Music app now supports time-synced lyrics for Apple Music subscribers. (53877474)

### Safari

#### New Features

- Content Blocker extensions delivered with Mac Catalyst apps are now available for use in Safari. (43646265)

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