There is a firmware update also for the eight year old Sony A7rIII ( firmware page here ). Here are the improvements:

• Allows the camera to display a notification when new software is available
• WPA and WEP functionalities are no longer supported. You will no longer be able to select WPA or WEP when connecting to Wi-Fi. Please use the more secure WPA2 moving forward
• Improves the operational stability of the camera
  Note: This update is only available for Windows and macOS. A memory card version is not provided.

Nice to see Sony updating an old model! We want to see more of that :)

UPDATE: Also theses cameras got a firmware update: ZV-E10 ( firmware here ), A7rIV ( firmware here ) and A7III ( firmware here )

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Thanks to the tipster ;)