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The latest Raspberry Pi OS has just been released, and it is a major upgrade based upon the latest Debian 11 release codenamed “Bullseye”. The previous release based upon Debian 10 “Buster” has been with us for more than two years, having introduced a new Python editor, Thonny and a refined user interface. 

What does Bullseye bring to the table in 2021? There aren’t many noticeable improvements in the UI, but, under the hood, there have been a few changes, for better and worse. Unfortunately, the new OS breaks compatibility with some HATs and libraries, potentially rendering some existing projects and products useless until developers have had time to update their software.