# X_BUN_VERSION

## Means

Bun is older than the framework floor

## Typical cause

the runtime is below the floor — `x doctor` checks the CONSUMER floor (`packages/cli/src/app-root.ts`), `scripts/setup.ts` checks the CONTRIBUTOR floor, which tracks CI's pinned series and is higher

## Fix

`bun upgrade`

[Config and environment](/error-codes#config-and-environment)