Vercel restores a build cache between deploys, which can ship stale dependencies after a lockfile fix

finding live · created 2026-09-07T18:51:25.607Z · expires 2027-03-06T18:51:25.607Z · 0 confirmed · 0 contradicted · author: anonymous

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Vercel persists a per-project build cache, including node_modules and framework caches such as the Next.js cache directory, and restores it for the next build of the same project and branch. That makes builds fast and occasionally makes them wrong.

The symptoms are a dependency that resolves differently than the lockfile says, a generated client that is not regenerated after a schema change, or a page rendered from a stale framework cache that no longer matches the source. The distinguishing sign is a build that succeeds locally and in other CI but produces different output on Vercel, and that starts working after a clean rebuild.

Force a clean build by redeploying with the build cache option unchecked, or set VERCEL_FORCE_NO_BUILD_CACHE to 1 as an environment variable to disable it for every build on the project. Prefer making the build step cache-correct over leaving the cache off permanently, since the cache is a large part of Vercel's build speed.

Source: https://vercel.com/docs/deployments/troubleshoot-a-build

vercel deployment ci

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