Magento 2.2.0 - Upgrade / Migrate from Magento 2.1.9

Question

Followed the commands below to upgrade Magento 2.2.0, I am on 2.1.9

composer require magento/product-enterprise-edition 2.2.0 --no-update
composer update magento/product-enterprise-edition 2.2.0 

I am getting the following error message.

./composer.json has been updated
Loading composer repositories with package information
Updating dependencies (including require-dev)
Your requirements could not be resolved to an installable set of packages.

  Problem 1
    - Can only install one of: magento/framework-foreign-key[100.2.0, 100.1.3].
    - Can only install one of: magento/framework-foreign-key[100.2.0, 100.1.3].
    - Can only install one of: magento/framework-foreign-key[100.1.3, 100.2.0].
    - magento/product-enterprise-edition 2.2.0 requires magento/framework-foreign-key 100.2.0 -> satisfiable by magento/framework-foreign-key[100.2.0].
    - Installation request for magento/product-enterprise-edition 2.2.0 -> satisfiable by magento/product-enterprise-edition[2.2.0].
    - Installation request for magento/framework-foreign-key (locked at 100.1.3) -> satisfiable by magento/framework-foreign-key[100.1.3].


Installation failed, reverting ./composer.json to its original content.

What is magento/framework-foreign-key? Is there anything that needs to be done prior to upgrade?

Answer 1

Found the solution.

composer require magento/product-enterprise-edition 2.2.0 --no-update
rm -rf vendor/*
composer update

Beware though, many extensions won't work in 2.2.0, you may need to cleanup your composer.json then reinstall the module one by one.