BTW: A Catalina user said every time he runs Safari Technology Preview 125 a popup says:

This version of macOS no longer receives updates to Safari Technology Preview.

To continue testing with the latest WebKit features and enhancements, upgrade to macOS Big Sur in the App Store.
(with "Not Now" and "Open App Store" buttons)

Articles on security fixes (revised May 26th)
• About the security content of Security Update 2021-003 Catalina
• About the security content of Security Update 2021-004 Mojave
  
  Download Pages for the Security Updates (posted June 2nd)
• Download Security Update 2021-003 Catalina (1.43 GB)
• Download Security Update 2021-004 Mojave (1.79 GB)

"macOS 11.4 adds Apple Podcasts subscriptions & channels and includes important bug fixes.

Podcasts
- Apple Podcasts subscriptions available for purchase via monthly & annual subscriptions.
- Channels group together collections of shows from podcast creators.

This release also fixes the following issues:
- Safari Bookmarks 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. "

• Using MDM to install software updates works more reliably on Macs with Apple silicon.
• Fixes issue where first login with a mobile account does not create a login keychain.
• Setup Assistant no longer skips Location Services when account creation is skipped by MDM.
• App installations from MDM are no longer canceled during setup when the country is changed.
• Fixes issue where DNS lookups may fail when using an authenticated proxy or a proxy configured with a PAC file.
• Fixes issue where the Kerberos SSO extension may fail to renew credentials.
• Fixes issue where iCloud Keychain sync could not be restricted by MDM.
• Fixes issue where StorNext volumes from fsforeignservers file would not mount automatically.

Check for feedback in Apple's Big Sur forum. (Replies may be in previous problem threads.)
And for M1 Mac owners, also check the Mac Mini, MacBook Pro, & MacBook Air forums.

• About the security content of Safari 14.1.1
  - Available for macOS Catalina and macOS Mojave.
  
  
• iOS 14.6 release notes
• iPadOS 14.6 release notes
• About the security content of iOS 14.6 and iPadOS 14.6 (long list)
  
  
• tvOS release notes updated with 14.6 info.
  - "This update includes general performance and stability improvements".
• About the security content of tvOS 14.6 (long list)
  
  
• watchOS 7.5 release notes
• About the security content of watchOS 7.5 (long list)

"This is DisplayLink macOS AppStore app v1.3.0 release.
This version supports macOS versions 10.15.x and 11.2. (note 11.3 info in changes below.)

Changes in 1.3.1 release
- Sometimes when closing the lid, DisplayLink Manager would be terminated.
- Re-added 4k mode on Apple M1 macBooks missing after macOS 11.3 update.
- Some DL-4xxx displays remain black after update, requiring power cycling.
- DL-4xxx devices may temporarily go black or freeze after 5-10 minutes while playing video.

Classic DisplayLink driver 5.2.5 stays available for macOS 10.14 Mojave and macOS 10.15 Catalina. Visit www.displaylink.com/mac to download the fully featured current classic driver package."

• New patch optimises the XCOM 2 Collection on iOS (feral interactive)
  
  
• New Apple Developer Forums features now available (apple)
  
  
• Apple Entrepreneur Camp participants break barriers on their coding journeys (pr)
  
  
• Apple's online Worldwide Developers Conference starts June 7 with keynote address (pr)

• Mac mini (M1, 2020) - Technical specifications (revised May 26)
  
  
• If Touch ID isn't working on your Magic Keyboard with Touch ID
  - Magic Keyboard with Touch ID requires a Apple silicon Mac & macOS 11.4 or later.
  
  
• If you can't connect your Magic Keyboard, Magic Mouse, or Magic Trackpad to your Mac
  
  
• Use your iMac as a display with Target Display Mode
  
  
• About lossless audio in Apple Music
  - with "How to listen to lossless" on iPhone/iPad, Macs, & Apple TV 4K, and FAQ.
  
  
• Delete spam calendars and events on iPhone
  
  
• Use your Siri Remote or Apple TV Remote with your Apple TV
  
  
• Find out which macOS your Mac is using

• Chrome 91.0.4472.77 Stable Channel Update (with 32 security fixes)
  
  
• Sony Z9D, A1E, 2016-2019 TVs Firmware Update 6.7165
  - The update download page's Applicable models list includes several other models.
  
  
• LG CX/GX/WX OLED TVs Firmware Update 03.21.21
  - added FYI about some owners saying the update made the TV dimmer.
  
  
• Yamaha: Update for HDMI 2.1 Compatibility of Select 2020 AV Receivers with Certain Gaming, Video Devices (May 2021). Affected models: RX-V4A, RX-V6A, RX-A2A, TSR-400 and TSR-700, for certain pass-through compatibility with Xbox Series X, NVIDIA RTX30. See article for details on "A free update program will be available starting in fall 2021 to update the HDMI board on these AV receivers...". (Added this to the original post on the Audio topics page.)