how to fix issue when magento upgrade from 2.3.4 to 2.4.3?

Question

I'd like to upgrade magento from 2.3.4 to 2.4.3. But I cannot upgrade it. this is error.

Your requirements could not be resolved to an installable set of packages.

Problem 1 - Root composer.json requires magento/product-community-edition 2.4.3 -> satisfiable by magento/product-community-edition[2.4.3]. - magento/product-community-edition 2.4.3 requires php ~7.3.0||~7.4.0 -> your php version (7.2.34) does not satisfy that requirement. Problem 2 - Root composer.json requires dealerdirect/phpcodesniffer-composer-installer ^0.5.0 -> satisfiable by dealerdirect/phpcodesniffer-composer-installer[v0.5.0]. - dealerdirect/phpcodesniffer-composer-installer v0.5.0 requires composer-plugin-api ^1.0 -> found composer-plugin-api[2.2.0] but it does not match the constraint.

Use the option --with-all-dependencies (-W) to allow upgrades, downgrades and removals for packages currently locked to specific versions.

I am using cpanel now. In cpanel I set php version is 7.4

PHP 7.4.33 (cli) (built: Nov 10 2022 11:12:07) ( NTS ) Copyright (c) The PHP Group Zend Engine v3.4.0, Copyright (c) Zend Technologies with Zend OPcache v7.4.33, Copyright (c), by Zend Technologies

what is the reason?

Answer 1

See if you're really using php 7.4 by typing php -v in the terminal. When you are sure that your php version is correct, delete the composer.lock file (make a backup beforehand). Try updating with the command:

composer require magento/product-community-edition:2.4.5 -W

If that doesn't work, post the contents of the composer.json file

Answer 2

If you are migrating from 2.3.4 to 2.4.3, you need to make the following and please follow these below steps:

1: Backup composer.json: Run the command

cp composer.json composer.json.bak

2: Upgrade your Magento: Run the commmand

composer require-commerce magento/<product> <version> --no-update [--interactive-root-conflicts] [--force-root-updates] [--help]

3: Update the dependecies:

composer update

For example, Specify the metapackage:

Magento Open Source: composer require-commerce magento/product-community-edition 2.4.4 --no-update

Adobe Commerce: composer require-commerce magento/product-enterprise-edition 2.4.4 --no-update

4: Composer Update: Run composer update

5: Update the database schema and data. bin/magento setup:upgrade

6: Disable Magento maintenance mode. bin/magento maintenance:disable

7: Restart Varnish. (Optional) Restart Varnish If you use it for page caching: service varnish restart

Please switch to PHP 7.4 first then check perform the upgrade.