diff --git a/.travis.yml b/.travis.yml
index 107a046..c36215d 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,16 +1,33 @@
 language: php
 
+sudo: false
+
+cache:
+  directories:
+    - $HOME/.composer/cache/files
+
 php:
   - 5.3
+  - 5.4
+  # 5.5 and 5.6 are already covered by the jobs running against specific Symfony versions. no need to duplicate them here
+  - 7.0
+  - hhvm
+
+matrix:
+  include:
+    # force testing against Symfony LTS versions
+    - php: 5.5
+      env: SYMFONY_VERSION=2.3.*
+    - php: 5.6
+      env: SYMFONY_VERSION=2.7.*
+    # Test against lowest dependencies
+    - php: 5.6
+      env: COMPOSER_FLAGS='--prefer-lowest --prefer-stable'
 
-env:
-    - SYMFONY_VERSION=2.3.*
-    - SYMFONY_VERSION=2.4.*
-    - SYMFONY_VERSION=2.5.*
+before_install:
+  - if [ "$SYMFONY_VERSION" != "" ]; then composer require --dev --no-update symfony/symfony=$SYMFONY_VERSION; fi
 
-before_script:
-    - composer self-update
-    - composer require symfony/framework-bundle:${SYMFONY_VERSION} --no-update
-    - composer install --dev --prefer-source
+install:
+  - composer update $COMPOSER_FLAGS
 
 script: phpunit --coverage-text
diff --git a/composer.json b/composer.json
index 3dd8269..8c3d04d 100755
--- a/composer.json
+++ b/composer.json
@@ -22,7 +22,8 @@
         "symfony/framework-bundle": "~2.3"
     },
     "require-dev": {
-        "phpunit/phpunit": "~3.7"
+        "symfony/phpunit-bridge": "~2.7",
+        "phpunit/phpunit": "~4.5"
     },
     "autoload": {
         "psr-4": {
diff --git a/tests/DependencyInjection/KeenIOExtensionTest.php b/tests/DependencyInjection/KeenIOExtensionTest.php
index 97481bc..16dbf33 100644
--- a/tests/DependencyInjection/KeenIOExtensionTest.php
+++ b/tests/DependencyInjection/KeenIOExtensionTest.php
@@ -6,13 +6,10 @@
 use Symfony\Component\Config\FileLocator;
 use Symfony\Component\DependencyInjection\ContainerBuilder;
 use Symfony\Component\DependencyInjection\Loader\YamlFileLoader;
-use Symfony\Component\DependencyInjection\ParameterBag\ParameterBag;
 
 class KeenIOExtensionTest extends \PHPUnit_Framework_TestCase
 {
     /**
-     * QPush Extension
-     *
      * @var KeenIOExtension
      */
     private $extension;