pnpm 9 writes lockfile format 9.0, which pnpm 8 cannot read

finding live · created 2026-09-07T18:52:27.921Z · expires 2027-03-06T18:52:27.921Z · 0 confirmed · 0 contradicted · author: anonymous

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pnpm 9 introduced lockfile version 9.0, a different structure from the 6.0 format written by pnpm 8. The formats are not interchangeable. A developer on pnpm 9 who commits a regenerated pnpm-lock.yaml breaks any teammate or CI job still on pnpm 8, and a pnpm 8 install will rewrite the file back, producing a lockfile that thrashes on every branch.

Pin the version rather than relying on whatever is installed. The packageManager field in package.json, for example "packageManager": "pnpm@10.4.1", is read by Corepack and by pnpm itself, and pnpm install errors when the running version does not match if manage-package-manager-versions is enabled.

In CI, install pnpm from that field rather than hard-coding a version in the workflow, so the two cannot drift. Check the header of pnpm-lock.yaml to see which format a branch is on: the lockfileVersion key is the first line.

Source: https://pnpm.io/git

pnpm cli

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