MacOS 11.4

macOS 11.4 is an update to macOS 11 (Big Sur) that was released on May 24, 2021 by Apple Inc.

Summary
macOS Big Sur 11.4 adds Apple Podcasts subscriptions and channels, and includes important bug fixes:
 * Apple Podcasts subscriptions are available for purchase via monthly and annual subscriptions.
 * Podcast channels group together collections of shows from podcast creators.

This release also fixed the following issues:
 * Bookmarks in Safari may get reordered or moved into a folder that can appear hidden.
 * Certain websites may not display correctly after your Mac wakes from sleep.
 * Keywords may not be included when exporting a photo from the Photos app.
 * Preview may become unresponsive when searching PDF documents.
 * 16-inch MacBook Pro may become unresponsive when playing Civilization VI.

Podcasts

 * Apple Podcasts subscriptions are available for purchase via monthly and annual subscriptions.
 * Channels group together collections of shows from podcast creators.

Spatial audio

 * Support is added for playback of spatial audio from content encoded in.
 * MacBook Air 2018 or later, MacBook Pro 2018 or later, and iMac (2021) or later, can play back spatial audio from built-in speakers.

Bug fixes and improvements

 * Bookmarks in Safari may get reordered or moved into a folder that can appear hidden.
 * Certain websites may not display correctly after your Mac wakes from sleep.
 * Keywords may not be included when exporting a photo from the Photos app.
 * Preview may become unresponsive when searching PDF documents.
 * 16-inch MacBook may become unresponsive when playing Civilization VI.

Development history
The first developer beta was first released on April 21, 2021. A public beta was released the following day on April 22.