Reinstall the Magento software

A contributing developer reinstalls Magento by updating composer.json to specify the Magento product version and component versions desired and runs composer update.

To reinstall the Magento software as a contributing developer:

Log in to your Magento server as a user with permissions to modify files in the Magento file system (for example, the >switch to the Magento file system owner.
Make a backup copy of composer.json in your Magento installation directory:
```
cd <your Magento install dir>
cp composer.json composer.json.bak
```
Open composer.json in a text editor.

Locate the following line:

 "require": {
	"magento/product-community-edition": "<version>"
},

Replace <version> with the version to which you want to upgrade, where <version> is the product version to use.

(The product version is in the format 2.0.x) .
Save your changes to composer.json and exit the text editor.
Enter the following command:
```
composer update
```
Wait for dependencies to update.
Install the Magento software.