https://wccftech.com/amd-confirms-ryzen-4000-zen-3-cpu-compatibility-x570-b550-chipset-motherboards/

AMD has officially announced that its next-generation Ryzen 4000 CPUs based on the Zen 3 core architecture will be supported by X570 and B550 chipset based motherboards. This suggests that those willing to upgrade to a Zen 3 based processor will have to upgrade to either a 500-series or new-generation of motherboards that will be available later this year.

AMD has so far offered inter-compatibility with all Ryzen CPUs on its AM4 socket with existing 300, 400, and 500 series chipsets however things will change with the launch of the 4th Generation CPU family based on the Zen 3 core architecture.