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php 8.2 + laravel 9 failed with composer error that cron-expression does not match the constraint

Hi everyone,

I recently tried to update my PHP version to 8.2 and also upgrade my Laravel framework to version 9. However, I encountered an issue while using Composer to install the dependencies for Laravel 9. The error message I received stated that the cron-expression package did not match the constraint.

I'm not quite sure what this error means or how to resolve it. Can someone please provide some guidance on how to fix this issue? I'm relatively new to PHP and Laravel, so any help would be greatly appreciated.

Thank you in advance!

All Replies



I faced a similar issue while upgrading PHP to version 8.2 and Laravel to version 9. The composer error regarding the incompatible cron-expression constraint was quite frustrating.

After some trial and error, I managed to resolve the issue in my case by manually specifying the compatible version of the cron-expression package in the composer.json file.

What worked for me was using the caret (^) operator followed by the specific version number of the cron-expression package. It looked something like this:

"require": {
"cron/cron-expression": "^2.5"

By using the caret operator, Composer fetched the latest compatible version of the cron-expression package that matched the required constraint.

Once you've updated the composer.json file, save the changes and run the `composer update` command to install the correct version of the cron-expression package.

I hope this helps you overcome the composer error and successfully upgrade your Laravel project to version 9.

Let me know if you have any further questions or if you need additional assistance!


Hey there,

I've encountered a similar issue before when upgrading my PHP version and Laravel framework. The error message about the cron-expression package not matching the constraint usually occurs when there is a compatibility issue between the versions of Laravel and the cron-expression package.

To resolve this issue, you can try updating the version constraint of the cron-expression package in your composer.json file. Check the laravel/laravel repository or the Laravel documentation for the compatible version of the cron-expression package with Laravel 9.

Once you find the appropriate version, you can update the require section in your composer.json file like this:

"require": {
"cron/cron-expression": "[version]"

Replace `[version]` with the compatible version number you found. After updating the composer.json file, run `composer update` to install the updated package.

If this doesn't work or you're unsure about the compatible version, you may want to check if any other dependencies in your project are causing conflicts. You can try running `composer outdated` to see if any packages have newer versions available. Updating those packages might resolve the issue.

If none of these solutions work or you need further assistance, don't hesitate to let us know.

Good luck!

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