From the GitHub release page:

Another small release for new boards! This has one fix for the ItsyBitsy M0 and pIRkey upcoming boards. Other boards don’t actually need to be updated.

Installation

To install follow the instructions in our new Welcome to CircuitPython! guide. To install the latest libraries, see this page in that guide.

Try the latest version of the Mu editor for creating and editing your CircuitPython programs and for easy access to the CircuitPython serial connection (the REPL).

All builds except ESP8266 are available as both UF2 and bin files here along with test builds.

Changes since 2.2.1

• @ladyada added one fix for the upcoming ItsyBitsy M0 Express.
• @ladyada added pIRkey support.

Thanks

Thank you to all who used, tested, contributed helped out, and participated on GitHub and/or discord:
@ladyada, @dhalbert, and surely more we have missed. Join us on the Discord chat to collaborate.

Documentation

Documentation is available in readthedocs.io.

Here are all the changes since 2.2.1.

This release is based on MicroPython 1.9.2. Support upstream MicroPython by purchasing a PyBoard (from Adafruit here).

Troubleshooting

Check out this guide for info on common problems with CircuitPython. If you are still having, then post to the Adafruit Support Forums and join Discord.

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Note: 2.2.2 was incorrectly tagged so we’ve moved onto 2.2.3! Yay free numbers!