So MUI dropped v9 last week. And yes, they jumped Material UI straight from v7 to v9. There is no Material UI v8. The reason is pretty sensible. MUI X was already on v9, and they wanted to re-align the major versions across the whole ecosystem so you’re not spending 20 minutes every upgrade figuring out which version of @mui/x-data-grid pairs with which version of @mui/material.
