Manjaro Cinnamon with newest Cinnamon?

[HowTo] Update an application early to the latest version

Manjaro - Branch Compare

Arch Linux - cinnamon 5.2.7-1 (x86_64)

It was just updated to 5.2.7-1 in Arch 5 hours ago.
You might have to wait just a little bit longer for it to land here, and then through the Branches.