Magento2: Upgrade by composer

Run the following commands to update your magento version :

composer require magento/product-community-edition your-version --no-update
composer update
rm -rf var/di var/generation
php bin/magento cache:clean
php bin/magento cache:flush
php bin/magento setup:upgrade
php bin/magento setup:di:compile
php bin/magento indexer:reindex

Now check the updated version of magento

php bin/magento --version