language: php php: - 5.6 - 5.5 - 5.4 - hhvm install: composer require --no-update guzzlehttp/guzzle $GUZZLE_VERSION; composer update script: vendor/bin/phpunit env: - GUZZLE_VERSION: 4.2 - GUZZLE_VERSION: 5.0 - GUZZLE_VERSION: 5.2