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Vercel now supports pnpm v10.
New projects with a pnpm-lock.yaml file with lockfileVersion: '9.0' will automatically use pnpm v10 for Install and Build Commands. Existing projects will continue to use pnpm v9 for backwards compatibility, since pnpm v9 also uses lockfileVersion: '9.0'.
Check your build logs to see which version a deployment uses. If you'd like to manually upgrade or downgrade your version, use Corepack.
Visit the package managers documentation to learn more.