diff --git a/src/Symfony/Bridge/Twig/DataCollector/TwigDataCollector.php b/src/Symfony/Bridge/Twig/DataCollector/TwigDataCollector.php
index f18c77233a..fd6bc2d1e2 100644
--- a/src/Symfony/Bridge/Twig/DataCollector/TwigDataCollector.php
+++ b/src/Symfony/Bridge/Twig/DataCollector/TwigDataCollector.php
@@ -42,8 +42,10 @@ class TwigDataCollector extends DataCollector implements LateDataCollectorInterf
 
     /**
      * {@inheritdoc}
+     *
+     * @param \Throwable|null $exception
      */
-    public function collect(Request $request, Response $response, \Exception $exception = null)
+    public function collect(Request $request, Response $response/*, \Throwable $exception = null*/)
     {
     }
 
diff --git a/src/Symfony/Bundle/SecurityBundle/DataCollector/SecurityDataCollector.php b/src/Symfony/Bundle/SecurityBundle/DataCollector/SecurityDataCollector.php
index 28f440a3bc..4fb0b3f5f5 100644
--- a/src/Symfony/Bundle/SecurityBundle/DataCollector/SecurityDataCollector.php
+++ b/src/Symfony/Bundle/SecurityBundle/DataCollector/SecurityDataCollector.php
@@ -60,8 +60,10 @@ class SecurityDataCollector extends DataCollector implements LateDataCollectorIn
 
     /**
      * {@inheritdoc}
+     *
+     * @param \Throwable|null $exception
      */
-    public function collect(Request $request, Response $response, \Exception $exception = null)
+    public function collect(Request $request, Response $response/*, \Throwable $exception = null*/)
     {
         if (null === $this->tokenStorage) {
             $this->data = [
diff --git a/src/Symfony/Component/Cache/DataCollector/CacheDataCollector.php b/src/Symfony/Component/Cache/DataCollector/CacheDataCollector.php
index 666c328694..c63cd32f76 100644
--- a/src/Symfony/Component/Cache/DataCollector/CacheDataCollector.php
+++ b/src/Symfony/Component/Cache/DataCollector/CacheDataCollector.php
@@ -41,8 +41,10 @@ class CacheDataCollector extends DataCollector implements LateDataCollectorInter
 
     /**
      * {@inheritdoc}
+     *
+     * @param \Throwable|null $exception
      */
-    public function collect(Request $request, Response $response, \Exception $exception = null)
+    public function collect(Request $request, Response $response/*, \Throwable $exception = null*/)
     {
         $empty = ['calls' => [], 'config' => [], 'options' => [], 'statistics' => []];
         $this->data = ['instances' => $empty, 'total' => $empty];
diff --git a/src/Symfony/Component/Cache/composer.json b/src/Symfony/Component/Cache/composer.json
index bd8f7389dd..0f0033c408 100644
--- a/src/Symfony/Component/Cache/composer.json
+++ b/src/Symfony/Component/Cache/composer.json
@@ -41,6 +41,7 @@
     "conflict": {
         "doctrine/dbal": "<2.5",
         "symfony/dependency-injection": "<3.4",
+        "symfony/http-kernel": "<4.4",
         "symfony/var-dumper": "<4.4"
     },
     "autoload": {
diff --git a/src/Symfony/Component/ErrorHandler/Exception/FlattenException.php b/src/Symfony/Component/ErrorHandler/Exception/FlattenException.php
index 0eaa8e1b88..818cb9a277 100644
--- a/src/Symfony/Component/ErrorHandler/Exception/FlattenException.php
+++ b/src/Symfony/Component/ErrorHandler/Exception/FlattenException.php
@@ -11,6 +11,7 @@
 
 namespace Symfony\Component\ErrorHandler\Exception;
 
+use Symfony\Component\Debug\Exception\FatalThrowableError;
 use Symfony\Component\Debug\Exception\FlattenException as LegacyFlattenException;
 use Symfony\Component\HttpFoundation\Exception\RequestExceptionInterface;
 use Symfony\Component\HttpFoundation\Response;
@@ -70,7 +71,7 @@ class FlattenException extends LegacyFlattenException
         $e->setStatusCode($statusCode);
         $e->setHeaders($headers);
         $e->setTraceFromThrowable($exception);
-        $e->setClass(\get_class($exception));
+        $e->setClass($exception instanceof FatalThrowableError ? $exception->getOriginalClassName() : \get_class($exception));
         $e->setFile($exception->getFile());
         $e->setLine($exception->getLine());
 
diff --git a/src/Symfony/Component/ErrorHandler/Tests/Exception/FlattenExceptionTest.php b/src/Symfony/Component/ErrorHandler/Tests/Exception/FlattenExceptionTest.php
index 3413bd484e..d822d0b113 100644
--- a/src/Symfony/Component/ErrorHandler/Tests/Exception/FlattenExceptionTest.php
+++ b/src/Symfony/Component/ErrorHandler/Tests/Exception/FlattenExceptionTest.php
@@ -12,6 +12,7 @@
 namespace Symfony\Component\ErrorHandler\Tests\Exception;
 
 use PHPUnit\Framework\TestCase;
+use Symfony\Component\Debug\Exception\FatalThrowableError;
 use Symfony\Component\ErrorHandler\Exception\FlattenException;
 use Symfony\Component\HttpFoundation\Exception\SuspiciousOperationException;
 use Symfony\Component\HttpKernel\Exception\AccessDeniedHttpException;
@@ -129,6 +130,19 @@ class FlattenExceptionTest extends TestCase
         $this->assertInstanceOf($flattened->getClass(), $exception, 'The class is set to the class of the original exception');
     }
 
+    /**
+     * @group legacy
+     */
+    public function testWrappedThrowable()
+    {
+        $exception = new FatalThrowableError(new \DivisionByZeroError('Ouch', 42));
+        $flattened = FlattenException::create($exception);
+
+        $this->assertSame('Ouch', $flattened->getMessage(), 'The message is copied from the original error.');
+        $this->assertSame(42, $flattened->getCode(), 'The code is copied from the original error.');
+        $this->assertSame('DivisionByZeroError', $flattened->getClass(), 'The class is set to the class of the original error');
+    }
+
     public function testThrowable()
     {
         $error = new \DivisionByZeroError('Ouch', 42);
diff --git a/src/Symfony/Component/Form/Extension/DataCollector/FormDataCollector.php b/src/Symfony/Component/Form/Extension/DataCollector/FormDataCollector.php
index 72227a4b76..4d4a7b1251 100644
--- a/src/Symfony/Component/Form/Extension/DataCollector/FormDataCollector.php
+++ b/src/Symfony/Component/Form/Extension/DataCollector/FormDataCollector.php
@@ -80,8 +80,12 @@ class FormDataCollector extends DataCollector implements FormDataCollectorInterf
 
     /**
      * Does nothing. The data is collected during the form event listeners.
+     *
+     * {@inheritdoc}
+     *
+     * @param \Throwable|null $exception
      */
-    public function collect(Request $request, Response $response, \Exception $exception = null)
+    public function collect(Request $request, Response $response/*, \Throwable $exception = null*/)
     {
     }
 
diff --git a/src/Symfony/Component/Form/composer.json b/src/Symfony/Component/Form/composer.json
index 60bbe4351e..b6309a0012 100644
--- a/src/Symfony/Component/Form/composer.json
+++ b/src/Symfony/Component/Form/composer.json
@@ -32,7 +32,7 @@
         "symfony/config": "^3.4|^4.0|^5.0",
         "symfony/console": "^4.3|^5.0",
         "symfony/http-foundation": "^3.4|^4.0|^5.0",
-        "symfony/http-kernel": "^4.3",
+        "symfony/http-kernel": "^4.4",
         "symfony/security-csrf": "^3.4|^4.0|^5.0",
         "symfony/translation": "^4.2|^5.0",
         "symfony/var-dumper": "^4.3|^5.0"
@@ -43,7 +43,7 @@
         "symfony/dependency-injection": "<3.4",
         "symfony/doctrine-bridge": "<3.4",
         "symfony/framework-bundle": "<3.4",
-        "symfony/http-kernel": "<4.3",
+        "symfony/http-kernel": "<4.4",
         "symfony/intl": "<4.3",
         "symfony/translation": "<4.2",
         "symfony/twig-bridge": "<3.4.5|<4.0.5,>=4.0"
diff --git a/src/Symfony/Component/HttpClient/DataCollector/HttpClientDataCollector.php b/src/Symfony/Component/HttpClient/DataCollector/HttpClientDataCollector.php
index 471db4473d..4fdd4a671f 100644
--- a/src/Symfony/Component/HttpClient/DataCollector/HttpClientDataCollector.php
+++ b/src/Symfony/Component/HttpClient/DataCollector/HttpClientDataCollector.php
@@ -33,8 +33,10 @@ final class HttpClientDataCollector extends DataCollector
 
     /**
      * {@inheritdoc}
+     *
+     * @param \Throwable|null $exception
      */
-    public function collect(Request $request, Response $response, \Exception $exception = null)
+    public function collect(Request $request, Response $response/*, \Throwable $exception = null*/)
     {
         $this->initData();
 
diff --git a/src/Symfony/Component/HttpClient/composer.json b/src/Symfony/Component/HttpClient/composer.json
index f57a7aa2fe..d0722a70e2 100644
--- a/src/Symfony/Component/HttpClient/composer.json
+++ b/src/Symfony/Component/HttpClient/composer.json
@@ -31,10 +31,12 @@
         "php-http/httplug": "^1.0|^2.0",
         "psr/http-client": "^1.0",
         "symfony/dependency-injection": "^4.3|^5.0",
-        "symfony/http-kernel": "^4.3",
+        "symfony/http-kernel": "^4.4",
         "symfony/process": "^4.2|^5.0",
-        "symfony/service-contracts": "^1.0|^2",
-        "symfony/var-dumper": "^4.3|^5.0"
+        "symfony/service-contracts": "^1.0|^2"
+    },
+    "conflict": {
+        "symfony/http-kernel": "<4.4"
     },
     "autoload": {
         "psr-4": { "Symfony\\Component\\HttpClient\\": "" },
diff --git a/src/Symfony/Component/HttpKernel/DataCollector/AjaxDataCollector.php b/src/Symfony/Component/HttpKernel/DataCollector/AjaxDataCollector.php
index 86ca6963e4..356ce227e8 100644
--- a/src/Symfony/Component/HttpKernel/DataCollector/AjaxDataCollector.php
+++ b/src/Symfony/Component/HttpKernel/DataCollector/AjaxDataCollector.php
@@ -23,7 +23,12 @@ use Symfony\Component\HttpFoundation\Response;
  */
 class AjaxDataCollector extends DataCollector
 {
-    public function collect(Request $request, Response $response, \Exception $exception = null)
+    /**
+     * {@inheritdoc}
+     *
+     * @param \Throwable|null $exception
+     */
+    public function collect(Request $request, Response $response/*, \Throwable $exception = null*/)
     {
         // all collecting is done client side
     }
diff --git a/src/Symfony/Component/HttpKernel/DataCollector/ConfigDataCollector.php b/src/Symfony/Component/HttpKernel/DataCollector/ConfigDataCollector.php
index 5a839b2e76..3b63f3a99c 100644
--- a/src/Symfony/Component/HttpKernel/DataCollector/ConfigDataCollector.php
+++ b/src/Symfony/Component/HttpKernel/DataCollector/ConfigDataCollector.php
@@ -56,8 +56,10 @@ class ConfigDataCollector extends DataCollector implements LateDataCollectorInte
 
     /**
      * {@inheritdoc}
+     *
+     * @param \Throwable|null $exception
      */
-    public function collect(Request $request, Response $response, \Exception $exception = null)
+    public function collect(Request $request, Response $response/*, \Throwable $exception = null*/)
     {
         $this->data = [
             'app_name' => $this->name,
diff --git a/src/Symfony/Component/HttpKernel/DataCollector/DumpDataCollector.php b/src/Symfony/Component/HttpKernel/DataCollector/DumpDataCollector.php
index 7ace03ae68..6ed9abea5b 100644
--- a/src/Symfony/Component/HttpKernel/DataCollector/DumpDataCollector.php
+++ b/src/Symfony/Component/HttpKernel/DataCollector/DumpDataCollector.php
@@ -98,7 +98,12 @@ class DumpDataCollector extends DataCollector implements DataDumperInterface
         }
     }
 
-    public function collect(Request $request, Response $response, \Exception $exception = null)
+    /**
+     * {@inheritdoc}
+     *
+     * @param \Throwable|null $exception
+     */
+    public function collect(Request $request, Response $response/*, \Throwable $exception = null*/)
     {
         if (!$this->dataCount) {
             $this->data = [];
diff --git a/src/Symfony/Component/HttpKernel/DataCollector/EventDataCollector.php b/src/Symfony/Component/HttpKernel/DataCollector/EventDataCollector.php
index 4d4b3d37ef..89fd183386 100644
--- a/src/Symfony/Component/HttpKernel/DataCollector/EventDataCollector.php
+++ b/src/Symfony/Component/HttpKernel/DataCollector/EventDataCollector.php
@@ -40,8 +40,10 @@ class EventDataCollector extends DataCollector implements LateDataCollectorInter
 
     /**
      * {@inheritdoc}
+     *
+     * @param \Throwable|null $exception
      */
-    public function collect(Request $request, Response $response, \Exception $exception = null)
+    public function collect(Request $request, Response $response/*, \Throwable $exception = null*/)
     {
         $this->currentRequest = $this->requestStack && $this->requestStack->getMasterRequest() !== $request ? $request : null;
         $this->data = [
diff --git a/src/Symfony/Component/HttpKernel/DataCollector/ExceptionDataCollector.php b/src/Symfony/Component/HttpKernel/DataCollector/ExceptionDataCollector.php
index 0a00a2e40e..222cae5d2d 100644
--- a/src/Symfony/Component/HttpKernel/DataCollector/ExceptionDataCollector.php
+++ b/src/Symfony/Component/HttpKernel/DataCollector/ExceptionDataCollector.php
@@ -26,9 +26,13 @@ class ExceptionDataCollector extends DataCollector
 {
     /**
      * {@inheritdoc}
+     *
+     * @param \Throwable|null $exception
      */
-    public function collect(Request $request, Response $response, \Exception $exception = null)
+    public function collect(Request $request, Response $response/*, \Throwable $exception = null*/)
     {
+        $exception = 2 < \func_num_args() ? func_get_arg(2) : null;
+
         if (null !== $exception) {
             $this->data = [
                 'exception' => FlattenException::createFromThrowable($exception),
diff --git a/src/Symfony/Component/HttpKernel/DataCollector/LoggerDataCollector.php b/src/Symfony/Component/HttpKernel/DataCollector/LoggerDataCollector.php
index e3e587927a..9314e432e1 100644
--- a/src/Symfony/Component/HttpKernel/DataCollector/LoggerDataCollector.php
+++ b/src/Symfony/Component/HttpKernel/DataCollector/LoggerDataCollector.php
@@ -43,8 +43,10 @@ class LoggerDataCollector extends DataCollector implements LateDataCollectorInte
 
     /**
      * {@inheritdoc}
+     *
+     * @param \Throwable|null $exception
      */
-    public function collect(Request $request, Response $response, \Exception $exception = null)
+    public function collect(Request $request, Response $response/*, \Throwable $exception = null*/)
     {
         $this->currentRequest = $this->requestStack && $this->requestStack->getMasterRequest() !== $request ? $request : null;
     }
diff --git a/src/Symfony/Component/HttpKernel/DataCollector/MemoryDataCollector.php b/src/Symfony/Component/HttpKernel/DataCollector/MemoryDataCollector.php
index ff64b56ab0..59758428c6 100644
--- a/src/Symfony/Component/HttpKernel/DataCollector/MemoryDataCollector.php
+++ b/src/Symfony/Component/HttpKernel/DataCollector/MemoryDataCollector.php
@@ -30,8 +30,10 @@ class MemoryDataCollector extends DataCollector implements LateDataCollectorInte
 
     /**
      * {@inheritdoc}
+     *
+     * @param \Throwable|null $exception
      */
-    public function collect(Request $request, Response $response, \Exception $exception = null)
+    public function collect(Request $request, Response $response/*, \Throwable $exception = null*/)
     {
         $this->updateMemoryUsage();
     }
diff --git a/src/Symfony/Component/HttpKernel/DataCollector/RequestDataCollector.php b/src/Symfony/Component/HttpKernel/DataCollector/RequestDataCollector.php
index f209190107..edfa6dee4c 100644
--- a/src/Symfony/Component/HttpKernel/DataCollector/RequestDataCollector.php
+++ b/src/Symfony/Component/HttpKernel/DataCollector/RequestDataCollector.php
@@ -36,8 +36,10 @@ class RequestDataCollector extends DataCollector implements EventSubscriberInter
 
     /**
      * {@inheritdoc}
+     *
+     * @param \Throwable|null $exception
      */
-    public function collect(Request $request, Response $response, \Exception $exception = null)
+    public function collect(Request $request, Response $response/*, \Throwable $exception = null*/)
     {
         // attributes are serialized and as they can be anything, they need to be converted to strings.
         $attributes = [];
diff --git a/src/Symfony/Component/HttpKernel/DataCollector/RouterDataCollector.php b/src/Symfony/Component/HttpKernel/DataCollector/RouterDataCollector.php
index a3b08ac531..5f12392330 100644
--- a/src/Symfony/Component/HttpKernel/DataCollector/RouterDataCollector.php
+++ b/src/Symfony/Component/HttpKernel/DataCollector/RouterDataCollector.php
@@ -34,9 +34,11 @@ class RouterDataCollector extends DataCollector
     /**
      * {@inheritdoc}
      *
+     * @param \Throwable|null $exception
+     *
      * @final since Symfony 4.4
      */
-    public function collect(Request $request, Response $response, \Exception $exception = null)
+    public function collect(Request $request, Response $response/*, \Throwable $exception = null*/)
     {
         if ($response instanceof RedirectResponse) {
             $this->data['redirect'] = true;
diff --git a/src/Symfony/Component/HttpKernel/DataCollector/TimeDataCollector.php b/src/Symfony/Component/HttpKernel/DataCollector/TimeDataCollector.php
index 744bab2212..7c0cdaa90d 100644
--- a/src/Symfony/Component/HttpKernel/DataCollector/TimeDataCollector.php
+++ b/src/Symfony/Component/HttpKernel/DataCollector/TimeDataCollector.php
@@ -35,8 +35,10 @@ class TimeDataCollector extends DataCollector implements LateDataCollectorInterf
 
     /**
      * {@inheritdoc}
+     *
+     * @param \Throwable|null $exception
      */
-    public function collect(Request $request, Response $response, \Exception $exception = null)
+    public function collect(Request $request, Response $response/*, \Throwable $exception = null*/)
     {
         if (null !== $this->kernel) {
             $startTime = $this->kernel->getStartTime();
diff --git a/src/Symfony/Component/HttpKernel/Profiler/Profiler.php b/src/Symfony/Component/HttpKernel/Profiler/Profiler.php
index 7a6b927fa0..60a623684c 100644
--- a/src/Symfony/Component/HttpKernel/Profiler/Profiler.php
+++ b/src/Symfony/Component/HttpKernel/Profiler/Profiler.php
@@ -12,6 +12,7 @@
 namespace Symfony\Component\HttpKernel\Profiler;
 
 use Psr\Log\LoggerInterface;
+use Symfony\Component\Debug\Exception\FatalThrowableError;
 use Symfony\Component\HttpFoundation\Exception\ConflictingHeadersException;
 use Symfony\Component\HttpFoundation\Request;
 use Symfony\Component\HttpFoundation\Response;
@@ -167,9 +168,14 @@ class Profiler implements ResetInterface
 
         $response->headers->set('X-Debug-Token', $profile->getToken());
 
+        $wrappedException = null;
         foreach ($this->collectors as $collector) {
-            $collector->collect($request, $response, $exception);
+            if (($e = $exception) instanceof \Error) {
+                $r = new \ReflectionMethod($collector, 'collect');
+                $e = 2 >= $r->getNumberOfParameters() || !($p = $r->getParameters()[2])->hasType() || \Exception::class !== $p->getType()->getName() ? $e : ($wrappedException ?? $wrappedException = new FatalThrowableError($e));
+            }
 
+            $collector->collect($request, $response, $e);
             // we need to clone for sub-requests
             $profile->addCollector(clone $collector);
         }
diff --git a/src/Symfony/Component/HttpKernel/Tests/Fixtures/DataCollector/CloneVarDataCollector.php b/src/Symfony/Component/HttpKernel/Tests/Fixtures/DataCollector/CloneVarDataCollector.php
index 168267b456..187241dbb9 100644
--- a/src/Symfony/Component/HttpKernel/Tests/Fixtures/DataCollector/CloneVarDataCollector.php
+++ b/src/Symfony/Component/HttpKernel/Tests/Fixtures/DataCollector/CloneVarDataCollector.php
@@ -24,7 +24,12 @@ class CloneVarDataCollector extends DataCollector
         $this->varToClone = $varToClone;
     }
 
-    public function collect(Request $request, Response $response, \Exception $exception = null)
+    /**
+     * {@inheritdoc}
+     *
+     * @param \Throwable|null $exception
+     */
+    public function collect(Request $request, Response $response/*, \Throwable $exception = null*/)
     {
         $this->data = $this->cloneVar($this->varToClone);
     }
diff --git a/src/Symfony/Component/Mailer/DataCollector/MessageDataCollector.php b/src/Symfony/Component/Mailer/DataCollector/MessageDataCollector.php
index dd6b284614..122ab342ad 100644
--- a/src/Symfony/Component/Mailer/DataCollector/MessageDataCollector.php
+++ b/src/Symfony/Component/Mailer/DataCollector/MessageDataCollector.php
@@ -31,8 +31,10 @@ final class MessageDataCollector extends DataCollector
 
     /**
      * {@inheritdoc}
+     *
+     * @param \Throwable|null $exception
      */
-    public function collect(Request $request, Response $response, \Exception $exception = null)
+    public function collect(Request $request, Response $response/*, \Throwable $exception = null*/)
     {
         $this->data['events'] = $this->events;
     }
diff --git a/src/Symfony/Component/Mailer/composer.json b/src/Symfony/Component/Mailer/composer.json
index f910a9771c..f78cb2a967 100644
--- a/src/Symfony/Component/Mailer/composer.json
+++ b/src/Symfony/Component/Mailer/composer.json
@@ -34,6 +34,7 @@
         "symfony/sendgrid-mailer": "^4.4|^5.0"
     },
     "conflict": {
+        "symfony/http-kernel": "<4.4",
         "symfony/sendgrid-mailer": "<4.4"
     },
     "autoload": {
diff --git a/src/Symfony/Component/Messenger/DataCollector/MessengerDataCollector.php b/src/Symfony/Component/Messenger/DataCollector/MessengerDataCollector.php
index 078cb86515..6e182f5444 100644
--- a/src/Symfony/Component/Messenger/DataCollector/MessengerDataCollector.php
+++ b/src/Symfony/Component/Messenger/DataCollector/MessengerDataCollector.php
@@ -34,8 +34,10 @@ class MessengerDataCollector extends DataCollector implements LateDataCollectorI
 
     /**
      * {@inheritdoc}
+     *
+     * @param \Throwable|null $exception
      */
-    public function collect(Request $request, Response $response, \Exception $exception = null)
+    public function collect(Request $request, Response $response/*, \Throwable $exception = null*/)
     {
         // Noop. Everything is collected live by the traceable buses & cloned as late as possible.
     }
diff --git a/src/Symfony/Component/Translation/DataCollector/TranslationDataCollector.php b/src/Symfony/Component/Translation/DataCollector/TranslationDataCollector.php
index 43f1d6aa5c..92c52dc9dd 100644
--- a/src/Symfony/Component/Translation/DataCollector/TranslationDataCollector.php
+++ b/src/Symfony/Component/Translation/DataCollector/TranslationDataCollector.php
@@ -46,8 +46,10 @@ class TranslationDataCollector extends DataCollector implements LateDataCollecto
 
     /**
      * {@inheritdoc}
+     *
+     * @param \Throwable|null $exception
      */
-    public function collect(Request $request, Response $response, \Exception $exception = null)
+    public function collect(Request $request, Response $response/*, \Throwable $exception = null*/)
     {
         $this->data['locale'] = $this->translator->getLocale();
         $this->data['fallback_locales'] = $this->translator->getFallbackLocales();
diff --git a/src/Symfony/Component/Translation/composer.json b/src/Symfony/Component/Translation/composer.json
index 110543a516..5b01b6ddc0 100644
--- a/src/Symfony/Component/Translation/composer.json
+++ b/src/Symfony/Component/Translation/composer.json
@@ -24,10 +24,9 @@
         "symfony/config": "^3.4|^4.0|^5.0",
         "symfony/console": "^3.4|^4.0|^5.0",
         "symfony/dependency-injection": "^3.4|^4.0|^5.0",
-        "symfony/http-kernel": "^3.4|^4.0",
+        "symfony/http-kernel": "^4.4",
         "symfony/intl": "^3.4|^4.0|^5.0",
         "symfony/service-contracts": "^1.1.2|^2",
-        "symfony/var-dumper": "^3.4|^4.0|^5.0",
         "symfony/yaml": "^3.4|^4.0|^5.0",
         "symfony/finder": "~2.8|~3.0|~4.0|^5.0",
         "psr/log": "~1.0"
@@ -35,6 +34,7 @@
     "conflict": {
         "symfony/config": "<3.4",
         "symfony/dependency-injection": "<3.4",
+        "symfony/http-kernel": "<4.4",
         "symfony/yaml": "<3.4"
     },
     "provide": {
diff --git a/src/Symfony/Component/Validator/DataCollector/ValidatorDataCollector.php b/src/Symfony/Component/Validator/DataCollector/ValidatorDataCollector.php
index 2555410f11..928f229325 100644
--- a/src/Symfony/Component/Validator/DataCollector/ValidatorDataCollector.php
+++ b/src/Symfony/Component/Validator/DataCollector/ValidatorDataCollector.php
@@ -39,8 +39,10 @@ class ValidatorDataCollector extends DataCollector implements LateDataCollectorI
 
     /**
      * {@inheritdoc}
+     *
+     * @param \Throwable|null $exception
      */
-    public function collect(Request $request, Response $response, \Exception $exception = null)
+    public function collect(Request $request, Response $response/*, \Throwable $exception = null*/)
     {
         // Everything is collected once, on kernel terminate.
     }
diff --git a/src/Symfony/Component/Validator/composer.json b/src/Symfony/Component/Validator/composer.json
index 8a7735c96e..fec833702d 100644
--- a/src/Symfony/Component/Validator/composer.json
+++ b/src/Symfony/Component/Validator/composer.json
@@ -24,8 +24,7 @@
     "require-dev": {
         "symfony/http-client": "^4.3|^5.0",
         "symfony/http-foundation": "^4.1|^5.0",
-        "symfony/http-kernel": "^3.4|^4.0",
-        "symfony/var-dumper": "^3.4|^4.0|^5.0",
+        "symfony/http-kernel": "^4.4",
         "symfony/intl": "^4.3|^5.0",
         "symfony/yaml": "^3.4|^4.0|^5.0",
         "symfony/config": "^3.4|^4.0|^5.0",
@@ -43,7 +42,7 @@
         "doctrine/lexer": "<1.0.2",
         "phpunit/phpunit": "<4.8.35|<5.4.3,>=5.0",
         "symfony/dependency-injection": "<3.4",
-        "symfony/http-kernel": "<3.4",
+        "symfony/http-kernel": "<4.4",
         "symfony/intl": "<4.3",
         "symfony/translation": ">=5.0",
         "symfony/yaml": "<3.4"