UPGRADE to 0.15 Table of Contents Upgrade Symfony from 2.8 to 3.4 Upgrade all dependencies to their last stable versions Upgrade Symfony from 2.8 to 3.4 Symfony changes: https://github.com/symfony/symfony/blob/3.4/UPGRADE-3.0.md https://github.com/symfony/symfony/blob/3.4/UPGRADE-3.1.md https://github.com/symfony/symfony/blob/3.4/UPGRADE-3.2.md https://github.com/symfony/symfony/blob/3.4/UPGRADE-3.4.md Upgrade all dependencies to their last stable versions