Composer "The lock file is not up to date with the latest changes in composer.json" in CI

By Daniel Zoghalchali·Latchkey

Composer stores a content-hash of your composer.json requires inside composer.lock. When they differ, Composer warns the lock is stale. With --no-update or a validate gate, this becomes a hard failure so CI does not install versions that no longer match the manifest.

What this error means

composer install or composer validate warns "The lock file is not up to date with the latest changes in composer.json. You may be getting outdated dependencies. It is recommended that you run composer update".

Warning: The lock file is not up to date with the latest changes in composer.json.
You may be getting outdated dependencies. It is recommended that you run
`composer update` or `composer update <package name>`.

Common causes

composer.json changed without relocking

A require was edited but composer.lock was not regenerated, so the stored content-hash no longer matches.

The lock was not committed with the manifest change

The manifest edit landed but the updated lock was left out of the commit.

How to fix it

Refresh the lock without changing versions

1. Run composer update --lock to update only the content-hash and metadata.
2. Commit the refreshed composer.lock.
3. Re-run CI so install matches the manifest.

composer update --lock
git add composer.lock

Gate drift with composer validate

Fail fast when the lock is stale so the fix lands with the manifest change.

composer validate --no-check-all --strict

How to prevent it

• Regenerate composer.lock whenever composer.json requires change.
• Commit the lock in the same commit as the manifest edit.
• Add composer validate --strict as a CI step.

Frequently asked questions

Related guides

References

• Composer documentation
• GitHub Actions documentation