diff --git a/src/Symfony/Bundle/FrameworkBundle/DependencyInjection/FrameworkExtension.php b/src/Symfony/Bundle/FrameworkBundle/DependencyInjection/FrameworkExtension.php
index 8d66bf1cf4ffc..e7461dce4f98f 100644
--- a/src/Symfony/Bundle/FrameworkBundle/DependencyInjection/FrameworkExtension.php
+++ b/src/Symfony/Bundle/FrameworkBundle/DependencyInjection/FrameworkExtension.php
@@ -20,6 +20,7 @@
 use Symfony\Component\DependencyInjection\Exception\LogicException;
 use Symfony\Component\DependencyInjection\Reference;
 use Symfony\Component\DependencyInjection\Loader\XmlFileLoader;
+use Symfony\Component\Config\Resource\ClassExistenceResource;
 use Symfony\Component\Config\Resource\FileResource;
 use Symfony\Component\Config\Resource\DirectoryResource;
 use Symfony\Component\Finder\Finder;
@@ -32,6 +33,7 @@
 use Symfony\Component\Serializer\Normalizer\DataUriNormalizer;
 use Symfony\Component\Serializer\Normalizer\DateTimeNormalizer;
 use Symfony\Component\Serializer\Normalizer\JsonSerializableNormalizer;
+use Symfony\Component\Translation\Translator;
 use Symfony\Component\Workflow;
 use Symfony\Component\Yaml\Yaml;
 
@@ -85,7 +87,8 @@ public function load(array $configs, ContainerBuilder $container)
         // A translator must always be registered (as support is included by
         // default in the Form component). If disabled, an identity translator
         // will be used and everything will still work as expected.
-        if (class_exists('Symfony\Component\Translation\Translator') || $this->isConfigEnabled($container, $config['form'])) {
+        $container->addResource(new ClassExistenceResource(Translator::class));
+        if (class_exists(Translator::class) || $this->isConfigEnabled($container, $config['form'])) {
             if (!class_exists('Symfony\Component\Translation\Translator')) {
                 throw new LogicException('Form support cannot be enabled as the Translation component is not installed.');
             }
diff --git a/src/Symfony/Bundle/FrameworkBundle/composer.json b/src/Symfony/Bundle/FrameworkBundle/composer.json
index 278fadaf98d10..c2045dd9386cb 100644
--- a/src/Symfony/Bundle/FrameworkBundle/composer.json
+++ b/src/Symfony/Bundle/FrameworkBundle/composer.json
@@ -20,7 +20,7 @@
         "symfony/cache": "~3.2",
         "symfony/class-loader": "~3.2",
         "symfony/dependency-injection": "~3.2",
-        "symfony/config": "~2.8|~3.0",
+        "symfony/config": "~3.2",
         "symfony/event-dispatcher": "~2.8|~3.0",
         "symfony/http-foundation": "~3.1",
         "symfony/http-kernel": "~3.2",
diff --git a/src/Symfony/Bundle/SecurityBundle/DependencyInjection/SecurityExtension.php b/src/Symfony/Bundle/SecurityBundle/DependencyInjection/SecurityExtension.php
index 4398a2a36d433..35b8078029af3 100644
--- a/src/Symfony/Bundle/SecurityBundle/DependencyInjection/SecurityExtension.php
+++ b/src/Symfony/Bundle/SecurityBundle/DependencyInjection/SecurityExtension.php
@@ -14,6 +14,7 @@
 use Symfony\Bundle\SecurityBundle\DependencyInjection\Security\Factory\SecurityFactoryInterface;
 use Symfony\Bundle\SecurityBundle\DependencyInjection\Security\UserProvider\UserProviderFactoryInterface;
 use Symfony\Component\Config\Definition\Exception\InvalidConfigurationException;
+use Symfony\Component\Config\Resource\ClassExistenceResource;
 use Symfony\Component\DependencyInjection\DefinitionDecorator;
 use Symfony\Component\DependencyInjection\Alias;
 use Symfony\Component\HttpKernel\DependencyInjection\Extension;
@@ -22,6 +23,7 @@
 use Symfony\Component\DependencyInjection\Reference;
 use Symfony\Component\Config\FileLocator;
 use Symfony\Component\Security\Core\Authorization\ExpressionLanguage;
+use Symfony\Component\ExpressionLanguage\ExpressionLanguage;
 
 /**
  * SecurityExtension.
@@ -70,7 +72,8 @@ public function load(array $configs, ContainerBuilder $container)
             $loader->load('security_debug.xml');
         }
 
-        if (!class_exists('Symfony\Component\ExpressionLanguage\ExpressionLanguage')) {
+        $container->addResource(new ClassExistenceResource(ExpressionLanguage::class));
+        if (!class_exists(ExpressionLanguage::class)) {
             $container->removeDefinition('security.expression_language');
             $container->removeDefinition('security.access.expression_voter');
         }
diff --git a/src/Symfony/Bundle/SecurityBundle/composer.json b/src/Symfony/Bundle/SecurityBundle/composer.json
index 3ee1325ea257d..a28d83044e979 100644
--- a/src/Symfony/Bundle/SecurityBundle/composer.json
+++ b/src/Symfony/Bundle/SecurityBundle/composer.json
@@ -24,6 +24,7 @@
     "require-dev": {
         "symfony/asset": "~2.8|~3.0",
         "symfony/browser-kit": "~2.8|~3.0",
+        "symfony/config": "~3.2",
         "symfony/console": "~2.8|~3.0",
         "symfony/css-selector": "~2.8|~3.0",
         "symfony/dom-crawler": "~2.8|~3.0",