Vercel + pnpm troubleshooting

Fix pnpm Lockfile Build Failed on Vercel

Vercel uses the committed lockfile to choose the package manager. A stale pnpm-lock.yaml can fail with frozen lockfile errors.

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Common symptoms

Build log mentions ERR_PNPM_OUTDATED_LOCKFILE.
Install works locally but fails on Vercel.
Repo contains multiple lockfiles.

What to check first

Platform: Vercel + pnpm
Error: pnpm lockfile error

Vercel uses the committed lockfile to choose the package manager. A stale pnpm-lock.yaml can fail with frozen lockfile errors.

Step-by-step fix

Run pnpm install locally and commit the updated pnpm-lock.yaml.
Remove unused package-lock.json or yarn.lock if pnpm is intended.
Set packageManager in package.json for clarity.
Redeploy after Vercel detects pnpm.

"packageManager": "pnpm@9.0.0"

pnpm install

Common mistake to avoid

Do not edit pnpm-lock.yaml by hand.

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