I don't really know what makes them go up a version, probably any big changes like DX12 in the latest one.
Just keep updated with the latest bigpet builds, as when the version number change comes it will probably only be a small difference between that and the latest bigpet build.
Desktop: Ryzen 7 5800X, Radeon RX 6800 XT, 2x8G DDR4 3600MHz, Manjaro Linux
Laptop: Ryzen 9 5900HX, Radeon RX 6700M, 2x8G DDR4 3200MHz, Manjaro Linux
Old Desktop: AMD FX-8350, Radeon R9 280X, 2x4G DDR3 1600MHz, Manjaro Linux