When using Composer, you might know that you should almost always include the
composer.lock file in VCS.
Now, the lock file includes a hash, which is generated from the contents of the
composer.json file, and more. Therefore, changing something in this file, for example, the
description, or something in the
config sections, will invalidate the hash that is currently included in the
If you try to interact with Composer, with an outdated lock file, it will tell you:
tfrommen@XPS:/hm/foo/bar (main * u=)$ composer install Loading composer repositories with package information Installing dependencies (including require-dev) from lock file 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 You may be getting outdated dependencies.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>`.
So, the question is how to refresh the lock file, right?
Well, Composer already said to run either
composer update, and thus update any package to the most recent version according to your version constraints, or
composer update <package name>, which still means updating, but just a single package. However, most of the time, you might not want to do this.
If you needed to change some config value—for Composer itself, or something else—can’t you just update just the
Yes, you can! And it’s even—somewhat hidden—in the official documentation:
composer update --lock
The above command will update the lock file, and nothing else.
It’s rather simple, but I don’t think a lot of people know about this, which is why we sometimes run into outdated
Maybe now not any longer…?
By the way, if you want to prevent this from happening, you could easily make
composer validate a required step in your build routine.
tfrommen@XPS:/hm/foo/bar (main * u=)$ composer validate The lock file is not up to date with the latest changes in composer.json, it is recommended that you run `composer update` or `composer update <package name>`. ./composer.json is valid
If you don’t care about unnecessary extra information, use this:
composer validate --no-check-all --no-check-publish
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