diff --git a/composer.lock b/composer.lock
index 97c6e64..48b3ba2 100644
--- a/composer.lock
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-                "reference": "e848750ceffdc4af374844c338c299627a98196a"
+                "reference": "df9a4f82143668c2f775cc85e1972044c9e93d4d"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/symfony/serializer/zipball/e848750ceffdc4af374844c338c299627a98196a",
-                "reference": "e848750ceffdc4af374844c338c299627a98196a",
+                "url": "https://api.github.com/repos/symfony/serializer/zipball/df9a4f82143668c2f775cc85e1972044c9e93d4d",
+                "reference": "df9a4f82143668c2f775cc85e1972044c9e93d4d",
                 "shasum": ""
             },
             "require": {
@@ -2247,20 +2252,20 @@
             ],
             "description": "Symfony Serializer Component",
             "homepage": "https://symfony.com",
-            "time": "2016-03-07 14:04:32"
+            "time": "2016-11-03 07:52:58"
         },
         {
             "name": "symfony/translation",
-            "version": "v2.8.4",
+            "version": "v2.8.15",
             "source": {
                 "type": "git",
                 "url": "https://github.com/symfony/translation.git",
-                "reference": "d60b8e076d22953aabebeebda53bf334438e7aca"
+                "reference": "edbe67e8f729885b55421d5cc58223d48540df07"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/symfony/translation/zipball/d60b8e076d22953aabebeebda53bf334438e7aca",
-                "reference": "d60b8e076d22953aabebeebda53bf334438e7aca",
+                "url": "https://api.github.com/repos/symfony/translation/zipball/edbe67e8f729885b55421d5cc58223d48540df07",
+                "reference": "edbe67e8f729885b55421d5cc58223d48540df07",
                 "shasum": ""
             },
             "require": {
@@ -2311,24 +2316,25 @@
             ],
             "description": "Symfony Translation Component",
             "homepage": "https://symfony.com",
-            "time": "2016-03-25 01:40:30"
+            "time": "2016-11-18 21:10:01"
         },
         {
             "name": "symfony/validator",
-            "version": "v2.8.4",
+            "version": "v2.8.15",
             "source": {
                 "type": "git",
                 "url": "https://github.com/symfony/validator.git",
-                "reference": "ea0ce99531c9eb82abf21011da4e111932f8ce81"
+                "reference": "1a2bad8d4669f55dc4f9fcd26071b5e78fb37bce"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/symfony/validator/zipball/ea0ce99531c9eb82abf21011da4e111932f8ce81",
-                "reference": "ea0ce99531c9eb82abf21011da4e111932f8ce81",
+                "url": "https://api.github.com/repos/symfony/validator/zipball/1a2bad8d4669f55dc4f9fcd26071b5e78fb37bce",
+                "reference": "1a2bad8d4669f55dc4f9fcd26071b5e78fb37bce",
                 "shasum": ""
             },
             "require": {
                 "php": ">=5.3.9",
+                "symfony/polyfill-mbstring": "~1.0",
                 "symfony/translation": "~2.4|~3.0.0"
             },
             "require-dev": {
@@ -2337,7 +2343,7 @@
                 "egulias/email-validator": "~1.2,>=1.2.1",
                 "symfony/config": "~2.2|~3.0.0",
                 "symfony/expression-language": "~2.4|~3.0.0",
-                "symfony/http-foundation": "~2.1|~3.0.0",
+                "symfony/http-foundation": "~2.3|~3.0.0",
                 "symfony/intl": "~2.7.4|~2.8|~3.0.0",
                 "symfony/property-access": "~2.3|~3.0.0",
                 "symfony/yaml": "~2.0,>=2.0.5|~3.0.0"
@@ -2383,20 +2389,20 @@
             ],
             "description": "Symfony Validator Component",
             "homepage": "https://symfony.com",
-            "time": "2016-03-27 12:57:53"
+            "time": "2016-12-08 15:59:39"
         },
         {
             "name": "symfony/yaml",
-            "version": "v2.8.4",
+            "version": "v2.8.15",
             "source": {
                 "type": "git",
                 "url": "https://github.com/symfony/yaml.git",
-                "reference": "584e52cb8f788a887553ba82db6caacb1d6260bb"
+                "reference": "befb26a3713c97af90d25dd12e75621ef14d91ff"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/symfony/yaml/zipball/584e52cb8f788a887553ba82db6caacb1d6260bb",
-                "reference": "584e52cb8f788a887553ba82db6caacb1d6260bb",
+                "url": "https://api.github.com/repos/symfony/yaml/zipball/befb26a3713c97af90d25dd12e75621ef14d91ff",
+                "reference": "befb26a3713c97af90d25dd12e75621ef14d91ff",
                 "shasum": ""
             },
             "require": {
@@ -2432,7 +2438,7 @@
             ],
             "description": "Symfony Yaml Component",
             "homepage": "https://symfony.com",
-            "time": "2016-03-04 07:54:35"
+            "time": "2016-11-14 16:15:57"
         },
         {
             "name": "twig/twig",
@@ -4099,25 +4105,25 @@
         },
         {
             "name": "symfony/browser-kit",
-            "version": "v2.7.6",
+            "version": "v3.2.1",
             "source": {
                 "type": "git",
                 "url": "https://github.com/symfony/browser-kit.git",
-                "reference": "07d664a052572ccc28eb2ab7dbbe82155b1ad367"
+                "reference": "34348c2691ce6254e8e008026f4c5e72c22bb318"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/symfony/browser-kit/zipball/07d664a052572ccc28eb2ab7dbbe82155b1ad367",
-                "reference": "07d664a052572ccc28eb2ab7dbbe82155b1ad367",
+                "url": "https://api.github.com/repos/symfony/browser-kit/zipball/34348c2691ce6254e8e008026f4c5e72c22bb318",
+                "reference": "34348c2691ce6254e8e008026f4c5e72c22bb318",
                 "shasum": ""
             },
             "require": {
-                "php": ">=5.3.9",
-                "symfony/dom-crawler": "~2.0,>=2.0.5"
+                "php": ">=5.5.9",
+                "symfony/dom-crawler": "~2.8|~3.0"
             },
             "require-dev": {
-                "symfony/css-selector": "~2.0,>=2.0.5",
-                "symfony/process": "~2.3.34|~2.7,>=2.7.6"
+                "symfony/css-selector": "~2.8|~3.0",
+                "symfony/process": "~2.8|~3.0"
             },
             "suggest": {
                 "symfony/process": ""
@@ -4125,13 +4131,16 @@
             "type": "library",
             "extra": {
                 "branch-alias": {
-                    "dev-master": "2.7-dev"
+                    "dev-master": "3.2-dev"
                 }
             },
             "autoload": {
                 "psr-4": {
                     "Symfony\\Component\\BrowserKit\\": ""
-                }
+                },
+                "exclude-from-classmap": [
+                    "/Tests/"
+                ]
             },
             "notification-url": "https://packagist.org/downloads/",
             "license": [
@@ -4149,20 +4158,20 @@
             ],
             "description": "Symfony BrowserKit Component",
             "homepage": "https://symfony.com",
-            "time": "2015-10-23 14:47:27"
+            "time": "2016-10-13 13:35:11"
         },
         {
             "name": "symfony/css-selector",
-            "version": "v2.8.4",
+            "version": "v2.8.15",
             "source": {
                 "type": "git",
                 "url": "https://github.com/symfony/css-selector.git",
-                "reference": "07b7ced3ae0c12918477c095453ea8595000810e"
+                "reference": "981abbbd6ba49af338a98490cbe29e7f39ca9fa9"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/symfony/css-selector/zipball/07b7ced3ae0c12918477c095453ea8595000810e",
-                "reference": "07b7ced3ae0c12918477c095453ea8595000810e",
+                "url": "https://api.github.com/repos/symfony/css-selector/zipball/981abbbd6ba49af338a98490cbe29e7f39ca9fa9",
+                "reference": "981abbbd6ba49af338a98490cbe29e7f39ca9fa9",
                 "shasum": ""
             },
             "require": {
@@ -4202,7 +4211,7 @@
             ],
             "description": "Symfony CssSelector Component",
             "homepage": "https://symfony.com",
-            "time": "2016-03-04 07:54:35"
+            "time": "2016-11-03 07:52:58"
         }
     ],
     "aliases": [],
diff --git a/core/lib/Drupal/Core/DrupalKernel.php b/core/lib/Drupal/Core/DrupalKernel.php
index 274a3fa..5c99840 100644
--- a/core/lib/Drupal/Core/DrupalKernel.php
+++ b/core/lib/Drupal/Core/DrupalKernel.php
@@ -1051,7 +1051,14 @@ protected function initializeSettings(Request $request) {
       if (!empty($loader)) {
         $this->classLoader->unregister();
         $loader->register();
+        $old_loader = $this->classLoader;
         $this->classLoader = $loader;
+        // The optimized classloader might be persistent and store cache misses.
+        // For example, once a cache miss is stored in APCu clearing it on a
+        // specific web-head will not clear any other web-heads. Therefore
+        // fallback to the composer class loader that only statically caches
+        // misses.
+        $old_loader->register();
       }
     }
   }