diff --git a/src/Symfony/Bundle/FrameworkBundle/CacheWarmer/AbstractPhpFileCacheWarmer.php b/src/Symfony/Bundle/FrameworkBundle/CacheWarmer/AbstractPhpFileCacheWarmer.php
index 23c04025a7..76714c2343 100644
--- a/src/Symfony/Bundle/FrameworkBundle/CacheWarmer/AbstractPhpFileCacheWarmer.php
+++ b/src/Symfony/Bundle/FrameworkBundle/CacheWarmer/AbstractPhpFileCacheWarmer.php
@@ -43,7 +43,7 @@ abstract class AbstractPhpFileCacheWarmer implements CacheWarmerInterface
     /**
      * {@inheritdoc}
      */
-    public function warmUp($cacheDir)
+    public function warmUp(string $cacheDir)
     {
         $arrayAdapter = new ArrayAdapter();
 
diff --git a/src/Symfony/Bundle/FrameworkBundle/CacheWarmer/RouterCacheWarmer.php b/src/Symfony/Bundle/FrameworkBundle/CacheWarmer/RouterCacheWarmer.php
index 6db604fa85..fecce2759f 100644
--- a/src/Symfony/Bundle/FrameworkBundle/CacheWarmer/RouterCacheWarmer.php
+++ b/src/Symfony/Bundle/FrameworkBundle/CacheWarmer/RouterCacheWarmer.php
@@ -35,11 +35,9 @@ class RouterCacheWarmer implements CacheWarmerInterface, ServiceSubscriberInterf
     }
 
     /**
-     * Warms up the cache.
-     *
-     * @param string $cacheDir The cache directory
+     * {@inheritdoc}
      */
-    public function warmUp($cacheDir)
+    public function warmUp(string $cacheDir)
     {
         $router = $this->container->get('router');
 
diff --git a/src/Symfony/Bundle/FrameworkBundle/CacheWarmer/TranslationsCacheWarmer.php b/src/Symfony/Bundle/FrameworkBundle/CacheWarmer/TranslationsCacheWarmer.php
index a47c28b9c4..28b6e439ab 100644
--- a/src/Symfony/Bundle/FrameworkBundle/CacheWarmer/TranslationsCacheWarmer.php
+++ b/src/Symfony/Bundle/FrameworkBundle/CacheWarmer/TranslationsCacheWarmer.php
@@ -36,7 +36,7 @@ class TranslationsCacheWarmer implements CacheWarmerInterface, ServiceSubscriber
     /**
      * {@inheritdoc}
      */
-    public function warmUp($cacheDir)
+    public function warmUp(string $cacheDir)
     {
         if (null === $this->translator) {
             $this->translator = $this->container->get('translator');
diff --git a/src/Symfony/Bundle/FrameworkBundle/HttpCache/HttpCache.php b/src/Symfony/Bundle/FrameworkBundle/HttpCache/HttpCache.php
index 66a8cd466e..037d0f067c 100644
--- a/src/Symfony/Bundle/FrameworkBundle/HttpCache/HttpCache.php
+++ b/src/Symfony/Bundle/FrameworkBundle/HttpCache/HttpCache.php
@@ -40,19 +40,14 @@ class HttpCache extends BaseHttpCache
     }
 
     /**
-     * Forwards the Request to the backend and returns the Response.
-     *
-     * @param bool     $raw   Whether to catch exceptions or not
-     * @param Response $entry A Response instance (the stale entry if present, null otherwise)
-     *
-     * @return Response A Response instance
+     * {@inheritdoc}
      */
-    protected function forward(Request $request, $raw = false, Response $entry = null)
+    protected function forward(Request $request, bool $catch = false, Response $entry = null)
     {
         $this->getKernel()->boot();
         $this->getKernel()->getContainer()->set('cache', $this);
 
-        return parent::forward($request, $raw, $entry);
+        return parent::forward($request, $catch, $entry);
     }
 
     /**
diff --git a/src/Symfony/Bundle/FrameworkBundle/Routing/Router.php b/src/Symfony/Bundle/FrameworkBundle/Routing/Router.php
index 3523c4c6c2..f9def3da5b 100644
--- a/src/Symfony/Bundle/FrameworkBundle/Routing/Router.php
+++ b/src/Symfony/Bundle/FrameworkBundle/Routing/Router.php
@@ -74,7 +74,7 @@ class Router extends BaseRouter implements WarmableInterface, ServiceSubscriberI
     /**
      * {@inheritdoc}
      */
-    public function warmUp($cacheDir)
+    public function warmUp(string $cacheDir)
     {
         $currentDir = $this->getOption('cache_dir');
 
diff --git a/src/Symfony/Bundle/FrameworkBundle/Translation/Translator.php b/src/Symfony/Bundle/FrameworkBundle/Translation/Translator.php
index dd6a213b59..a5426f666c 100644
--- a/src/Symfony/Bundle/FrameworkBundle/Translation/Translator.php
+++ b/src/Symfony/Bundle/FrameworkBundle/Translation/Translator.php
@@ -88,7 +88,7 @@ class Translator extends BaseTranslator implements WarmableInterface
     /**
      * {@inheritdoc}
      */
-    public function warmUp($cacheDir)
+    public function warmUp(string $cacheDir)
     {
         // skip warmUp when translator doesn't use cache
         if (null === $this->options['cache_dir']) {
diff --git a/src/Symfony/Bundle/FrameworkBundle/composer.json b/src/Symfony/Bundle/FrameworkBundle/composer.json
index 5162ed759d..ddd4fed9eb 100644
--- a/src/Symfony/Bundle/FrameworkBundle/composer.json
+++ b/src/Symfony/Bundle/FrameworkBundle/composer.json
@@ -23,7 +23,7 @@
         "symfony/dependency-injection": "^4.4|^5.0",
         "symfony/error-renderer": "^4.4|^5.0",
         "symfony/http-foundation": "^4.4|^5.0",
-        "symfony/http-kernel": "^4.4|^5.0",
+        "symfony/http-kernel": "^5.0",
         "symfony/polyfill-mbstring": "~1.0",
         "symfony/filesystem": "^4.4|^5.0",
         "symfony/finder": "^4.4|^5.0",