diff --git a/phpunit b/phpunit
index 9cf03f071ecb..9806b0053f6d 100755
--- a/phpunit
+++ b/phpunit
@@ -11,7 +11,7 @@
  */
 
 // Please update when phpunit needs to be reinstalled with fresh deps:
-// Cache-Id-Version: 2015-11-28 09:05 UTC
+// Cache-Id-Version: 2016-03-16 15:36 UTC
 
 use Symfony\Component\Process\ProcessUtils;
 
@@ -52,7 +52,7 @@ if (!file_exists("$PHPUNIT_DIR/phpunit-$PHPUNIT_VERSION/phpunit") || md5_file(__
     $zip->close();
     chdir("phpunit-$PHPUNIT_VERSION");
     passthru("$COMPOSER remove --no-update symfony/yaml");
-    passthru("$COMPOSER require --dev --no-update symfony/phpunit-bridge \">=2.8@dev\"");
+    passthru("$COMPOSER require --dev --no-update symfony/phpunit-bridge \">=3.1@dev\"");
     passthru("$COMPOSER install --prefer-dist --no-progress --ansi");
     file_put_contents('phpunit', <<<EOPHP
 <?php
diff --git a/phpunit.xml.dist b/phpunit.xml.dist
index 010114e0b9f3..29673772a479 100644
--- a/phpunit.xml.dist
+++ b/phpunit.xml.dist
@@ -50,7 +50,7 @@
         <listener class="Symfony\Bridge\PhpUnit\SymfonyTestsListener">
             <arguments>
                 <array>
-                    <element><string>Symfony\Component\HttpFoundation</string></element>
+                    <element key="time-sensitive"><string>Symfony\Component\HttpFoundation</string></element>
                 </array>
             </arguments>
         </listener>
diff --git a/src/Symfony/Component/HttpKernel/phpunit.xml.dist b/src/Symfony/Component/HttpKernel/phpunit.xml.dist
index 17c48935c715..b29969b36fe2 100644
--- a/src/Symfony/Component/HttpKernel/phpunit.xml.dist
+++ b/src/Symfony/Component/HttpKernel/phpunit.xml.dist
@@ -30,7 +30,7 @@
         <listener class="Symfony\Bridge\PhpUnit\SymfonyTestsListener">
             <arguments>
                 <array>
-                    <element><string>Symfony\Component\HttpFoundation</string></element>
+                    <element key="time-sensitive"><string>Symfony\Component\HttpFoundation</string></element>
                 </array>
             </arguments>
         </listener>
diff --git a/src/Symfony/Component/Validator/Tests/Constraints/EmailValidatorTest.php b/src/Symfony/Component/Validator/Tests/Constraints/EmailValidatorTest.php
index e291124f298d..10d17b5c68cd 100644
--- a/src/Symfony/Component/Validator/Tests/Constraints/EmailValidatorTest.php
+++ b/src/Symfony/Component/Validator/Tests/Constraints/EmailValidatorTest.php
@@ -11,9 +11,13 @@
 
 namespace Symfony\Component\Validator\Tests\Constraints;
 
+use Symfony\Bridge\PhpUnit\DnsMock;
 use Symfony\Component\Validator\Constraints\Email;
 use Symfony\Component\Validator\Constraints\EmailValidator;
 
+/**
+ * @group dns-sensitive
+ */
 class EmailValidatorTest extends AbstractConstraintValidatorTest
 {
     protected function createValidator()
@@ -86,4 +90,39 @@ public function getInvalidEmails()
             array('example@localhost'),
         );
     }
+
+    /**
+     * @dataProvider getDnsChecks
+     */
+    public function testDnsChecks($type, $violation)
+    {
+        DnsMock::withMockedHosts(array('example.com' => array(array('type' => $violation ? false : $type))));
+
+        $constraint = new Email(array(
+            'message' => 'myMessage',
+            'MX' === $type ? 'checkMX' : 'checkHost' => true,
+        ));
+
+        $this->validator->validate('foo@example.com', $constraint);
+
+        if (!$violation) {
+            $this->assertNoViolation();
+        } else {
+            $this->buildViolation('myMessage')
+                ->setParameter('{{ value }}', '"foo@example.com"')
+                ->assertRaised();
+        }
+    }
+
+    public function getDnsChecks()
+    {
+        return array(
+            array('MX', false),
+            array('MX', true),
+            array('A', false),
+            array('A', true),
+            array('AAAA', false),
+            array('AAAA', true),
+        );
+    }
 }