diff --git a/wcfsetup/install/files/lib/system/api/composer.json b/wcfsetup/install/files/lib/system/api/composer.json
index 243f7c55cfe..da977f942c9 100644
--- a/wcfsetup/install/files/lib/system/api/composer.json
+++ b/wcfsetup/install/files/lib/system/api/composer.json
@@ -15,7 +15,7 @@
         "true/punycode": "~2.0",
         "pear/net_idna2": "^0.2.0",
         "scssphp/scssphp": "^1.3",
-        "guzzlehttp/guzzle": "dev-6.5-windows"
+        "guzzlehttp/guzzle": "dev-6.5-woltlab"
     },
     "repositories": [
         {
diff --git a/wcfsetup/install/files/lib/system/api/composer.lock b/wcfsetup/install/files/lib/system/api/composer.lock
index 399e67d366c..42f21211ffe 100644
--- a/wcfsetup/install/files/lib/system/api/composer.lock
+++ b/wcfsetup/install/files/lib/system/api/composer.lock
@@ -4,7 +4,7 @@
         "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#installing-dependencies",
         "This file is @generated automatically"
     ],
-    "content-hash": "596e3570b2867b29d0b01279d2e862d6",
+    "content-hash": "e4709905ac8ea201053fb79a4a25e0da",
     "packages": [
         {
             "name": "chrisjean/php-ico",
@@ -144,16 +144,16 @@
         },
         {
             "name": "guzzlehttp/guzzle",
-            "version": "dev-6.5-windows",
+            "version": "dev-6.5-woltlab",
             "source": {
                 "type": "git",
                 "url": "https://github.com/WoltLab/guzzle",
-                "reference": "40e0ba7d933ec47237adb4f35ba363c3d8ffe453"
+                "reference": "6298db12d08c3c65c80971bb1b9f6f98e8a43c35"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/WoltLab/guzzle/zipball/40e0ba7d933ec47237adb4f35ba363c3d8ffe453",
-                "reference": "40e0ba7d933ec47237adb4f35ba363c3d8ffe453",
+                "url": "https://api.github.com/repos/WoltLab/guzzle/zipball/6298db12d08c3c65c80971bb1b9f6f98e8a43c35",
+                "reference": "6298db12d08c3c65c80971bb1b9f6f98e8a43c35",
                 "shasum": ""
             },
             "require": {
@@ -211,7 +211,7 @@
                 "rest",
                 "web service"
             ],
-            "time": "2020-10-09T13:06:06+00:00"
+            "time": "2021-02-01T09:42:51+00:00"
         },
         {
             "name": "guzzlehttp/promises",
@@ -1018,5 +1018,5 @@
         "php": "7.0.22",
         "ext-gd": "0"
     },
-    "plugin-api-version": "1.1.0"
+    "plugin-api-version": "2.0.0"
 }
diff --git a/wcfsetup/install/files/lib/system/api/composer/ClassLoader.php b/wcfsetup/install/files/lib/system/api/composer/ClassLoader.php
index 03b9bb9c40c..1a58957d25d 100644
--- a/wcfsetup/install/files/lib/system/api/composer/ClassLoader.php
+++ b/wcfsetup/install/files/lib/system/api/composer/ClassLoader.php
@@ -37,8 +37,8 @@
  *
  * @author Fabien Potencier <fabien@symfony.com>
  * @author Jordi Boggiano <j.boggiano@seld.be>
- * @see    http://www.php-fig.org/psr/psr-0/
- * @see    http://www.php-fig.org/psr/psr-4/
+ * @see    https://www.php-fig.org/psr/psr-0/
+ * @see    https://www.php-fig.org/psr/psr-4/
  */
 class ClassLoader
 {
diff --git a/wcfsetup/install/files/lib/system/api/composer/InstalledVersions.php b/wcfsetup/install/files/lib/system/api/composer/InstalledVersions.php
new file mode 100644
index 00000000000..d4979878038
--- /dev/null
+++ b/wcfsetup/install/files/lib/system/api/composer/InstalledVersions.php
@@ -0,0 +1,369 @@
+<?php
+
+namespace Composer;
+
+use Composer\Semver\VersionParser;
+
+
+
+
+
+
+class InstalledVersions
+{
+private static $installed = array (
+  'root' => 
+  array (
+    'pretty_version' => '1.0.0+no-version-set',
+    'version' => '1.0.0.0',
+    'aliases' => 
+    array (
+    ),
+    'reference' => NULL,
+    'name' => '__root__',
+  ),
+  'versions' => 
+  array (
+    '__root__' => 
+    array (
+      'pretty_version' => '1.0.0+no-version-set',
+      'version' => '1.0.0.0',
+      'aliases' => 
+      array (
+      ),
+      'reference' => NULL,
+    ),
+    'chrisjean/php-ico' => 
+    array (
+      'pretty_version' => '1.0.4',
+      'version' => '1.0.4.0',
+      'aliases' => 
+      array (
+      ),
+      'reference' => 'ccd5c0d56554f3ddcd7a823e695be83e0d1e43b6',
+    ),
+    'erusev/parsedown' => 
+    array (
+      'pretty_version' => '1.7.4',
+      'version' => '1.7.4.0',
+      'aliases' => 
+      array (
+      ),
+      'reference' => 'cb17b6477dfff935958ba01325f2e8a2bfa6dab3',
+    ),
+    'ezyang/htmlpurifier' => 
+    array (
+      'pretty_version' => 'v4.12.0',
+      'version' => '4.12.0.0',
+      'aliases' => 
+      array (
+      ),
+      'reference' => 'a617e55bc62a87eec73bd456d146d134ad716f03',
+    ),
+    'guzzlehttp/guzzle' => 
+    array (
+      'pretty_version' => 'dev-6.5-woltlab',
+      'version' => 'dev-6.5-woltlab',
+      'aliases' => 
+      array (
+      ),
+      'reference' => '6298db12d08c3c65c80971bb1b9f6f98e8a43c35',
+    ),
+    'guzzlehttp/promises' => 
+    array (
+      'pretty_version' => 'v1.3.1',
+      'version' => '1.3.1.0',
+      'aliases' => 
+      array (
+      ),
+      'reference' => 'a59da6cf61d80060647ff4d3eb2c03a2bc694646',
+    ),
+    'guzzlehttp/psr7' => 
+    array (
+      'pretty_version' => '1.6.1',
+      'version' => '1.6.1.0',
+      'aliases' => 
+      array (
+      ),
+      'reference' => '239400de7a173fe9901b9ac7c06497751f00727a',
+    ),
+    'pear/net_idna2' => 
+    array (
+      'pretty_version' => 'v0.2.0',
+      'version' => '0.2.0.0',
+      'aliases' => 
+      array (
+      ),
+      'reference' => '51734eaf8be2df58e8aad5835b9966459b2fb37c',
+    ),
+    'pear/pear_exception' => 
+    array (
+      'pretty_version' => 'v1.0.1',
+      'version' => '1.0.1.0',
+      'aliases' => 
+      array (
+      ),
+      'reference' => 'dbb42a5a0e45f3adcf99babfb2a1ba77b8ac36a7',
+    ),
+    'pelago/emogrifier' => 
+    array (
+      'pretty_version' => 'v2.1.1',
+      'version' => '2.1.1.0',
+      'aliases' => 
+      array (
+      ),
+      'reference' => '8ee7fb5ad772915451ed3415c1992bd3697d4983',
+    ),
+    'psr/http-message' => 
+    array (
+      'pretty_version' => '1.0.1',
+      'version' => '1.0.1.0',
+      'aliases' => 
+      array (
+      ),
+      'reference' => 'f6561bf28d520154e4b0ec72be95418abe6d9363',
+    ),
+    'psr/http-message-implementation' => 
+    array (
+      'provided' => 
+      array (
+        0 => '1.0',
+      ),
+    ),
+    'ralouphie/getallheaders' => 
+    array (
+      'pretty_version' => '3.0.3',
+      'version' => '3.0.3.0',
+      'aliases' => 
+      array (
+      ),
+      'reference' => '120b605dfeb996808c31b6477290a714d356e822',
+    ),
+    'scssphp/scssphp' => 
+    array (
+      'pretty_version' => '1.3',
+      'version' => '1.3.0.0',
+      'aliases' => 
+      array (
+      ),
+      'reference' => '261cd018025d5790e135a1e5b694d6af186e6bca',
+    ),
+    'symfony/css-selector' => 
+    array (
+      'pretty_version' => 'v3.4.42',
+      'version' => '3.4.42.0',
+      'aliases' => 
+      array (
+      ),
+      'reference' => '9ccf6e78077a3fc1596e6c7b5958008965a11518',
+    ),
+    'symfony/polyfill-intl-idn' => 
+    array (
+      'pretty_version' => 'v1.17.1',
+      'version' => '1.17.1.0',
+      'aliases' => 
+      array (
+      ),
+      'reference' => 'a57f8161502549a742a63c09f0a604997bf47027',
+    ),
+    'symfony/polyfill-mbstring' => 
+    array (
+      'pretty_version' => 'v1.17.1',
+      'version' => '1.17.1.0',
+      'aliases' => 
+      array (
+      ),
+      'reference' => '7110338d81ce1cbc3e273136e4574663627037a7',
+    ),
+    'symfony/polyfill-php72' => 
+    array (
+      'pretty_version' => 'v1.17.0',
+      'version' => '1.17.0.0',
+      'aliases' => 
+      array (
+      ),
+      'reference' => 'f048e612a3905f34931127360bdd2def19a5e582',
+    ),
+    'true/punycode' => 
+    array (
+      'pretty_version' => 'v2.1.1',
+      'version' => '2.1.1.0',
+      'aliases' => 
+      array (
+      ),
+      'reference' => 'a4d0c11a36dd7f4e7cd7096076cab6d3378a071e',
+    ),
+  ),
+);
+
+
+
+
+
+
+
+public static function getInstalledPackages()
+{
+return array_keys(self::$installed['versions']);
+}
+
+
+
+
+
+
+
+
+
+public static function isInstalled($packageName)
+{
+return isset(self::$installed['versions'][$packageName]);
+}
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+public static function satisfies(VersionParser $parser, $packageName, $constraint)
+{
+$constraint = $parser->parseConstraints($constraint);
+$provided = $parser->parseConstraints(self::getVersionRanges($packageName));
+
+return $provided->matches($constraint);
+}
+
+
+
+
+
+
+
+
+
+
+public static function getVersionRanges($packageName)
+{
+if (!isset(self::$installed['versions'][$packageName])) {
+throw new \OutOfBoundsException('Package "' . $packageName . '" is not installed');
+}
+
+$ranges = array();
+if (isset(self::$installed['versions'][$packageName]['pretty_version'])) {
+$ranges[] = self::$installed['versions'][$packageName]['pretty_version'];
+}
+if (array_key_exists('aliases', self::$installed['versions'][$packageName])) {
+$ranges = array_merge($ranges, self::$installed['versions'][$packageName]['aliases']);
+}
+if (array_key_exists('replaced', self::$installed['versions'][$packageName])) {
+$ranges = array_merge($ranges, self::$installed['versions'][$packageName]['replaced']);
+}
+if (array_key_exists('provided', self::$installed['versions'][$packageName])) {
+$ranges = array_merge($ranges, self::$installed['versions'][$packageName]['provided']);
+}
+
+return implode(' || ', $ranges);
+}
+
+
+
+
+
+public static function getVersion($packageName)
+{
+if (!isset(self::$installed['versions'][$packageName])) {
+throw new \OutOfBoundsException('Package "' . $packageName . '" is not installed');
+}
+
+if (!isset(self::$installed['versions'][$packageName]['version'])) {
+return null;
+}
+
+return self::$installed['versions'][$packageName]['version'];
+}
+
+
+
+
+
+public static function getPrettyVersion($packageName)
+{
+if (!isset(self::$installed['versions'][$packageName])) {
+throw new \OutOfBoundsException('Package "' . $packageName . '" is not installed');
+}
+
+if (!isset(self::$installed['versions'][$packageName]['pretty_version'])) {
+return null;
+}
+
+return self::$installed['versions'][$packageName]['pretty_version'];
+}
+
+
+
+
+
+public static function getReference($packageName)
+{
+if (!isset(self::$installed['versions'][$packageName])) {
+throw new \OutOfBoundsException('Package "' . $packageName . '" is not installed');
+}
+
+if (!isset(self::$installed['versions'][$packageName]['reference'])) {
+return null;
+}
+
+return self::$installed['versions'][$packageName]['reference'];
+}
+
+
+
+
+
+public static function getRootPackage()
+{
+return self::$installed['root'];
+}
+
+
+
+
+
+
+
+public static function getRawData()
+{
+return self::$installed;
+}
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+public static function reload($data)
+{
+self::$installed = $data;
+}
+}
diff --git a/wcfsetup/install/files/lib/system/api/composer/autoload_classmap.php b/wcfsetup/install/files/lib/system/api/composer/autoload_classmap.php
index cedefd86a7a..33a49c649b1 100644
--- a/wcfsetup/install/files/lib/system/api/composer/autoload_classmap.php
+++ b/wcfsetup/install/files/lib/system/api/composer/autoload_classmap.php
@@ -6,6 +6,7 @@
 $baseDir = $vendorDir;
 
 return array(
+    'Composer\\InstalledVersions' => $vendorDir . '/composer/InstalledVersions.php',
     'PEAR_Exception' => $vendorDir . '/pear/pear_exception/PEAR/Exception.php',
     'PHP_ICO' => $vendorDir . '/chrisjean/php-ico/class-php-ico.php',
 );
diff --git a/wcfsetup/install/files/lib/system/api/composer/autoload_real.php b/wcfsetup/install/files/lib/system/api/composer/autoload_real.php
index b52e8ecb453..7cc25acda31 100644
--- a/wcfsetup/install/files/lib/system/api/composer/autoload_real.php
+++ b/wcfsetup/install/files/lib/system/api/composer/autoload_real.php
@@ -22,6 +22,8 @@ public static function getLoader()
             return self::$loader;
         }
 
+        require __DIR__ . '/platform_check.php';
+
         spl_autoload_register(array('ComposerAutoloaderInitf07e6bf6487a19c1ad4a7f66aa2be118', 'loadClassLoader'), true, false);
         self::$loader = $loader = new \Composer\Autoload\ClassLoader();
         spl_autoload_unregister(array('ComposerAutoloaderInitf07e6bf6487a19c1ad4a7f66aa2be118', 'loadClassLoader'));
@@ -32,7 +34,7 @@ public static function getLoader()
 
         $useStaticLoader = PHP_VERSION_ID >= 50600 && !defined('HHVM_VERSION') && (!function_exists('zend_loader_file_encoded') || !zend_loader_file_encoded());
         if ($useStaticLoader) {
-            require_once __DIR__ . '/autoload_static.php';
+            require __DIR__ . '/autoload_static.php';
 
             call_user_func(\Composer\Autoload\ComposerStaticInitf07e6bf6487a19c1ad4a7f66aa2be118::getInitializer($loader));
         } else {
diff --git a/wcfsetup/install/files/lib/system/api/composer/autoload_static.php b/wcfsetup/install/files/lib/system/api/composer/autoload_static.php
index efaa5f29e4a..9144259f89b 100644
--- a/wcfsetup/install/files/lib/system/api/composer/autoload_static.php
+++ b/wcfsetup/install/files/lib/system/api/composer/autoload_static.php
@@ -115,6 +115,7 @@ class ComposerStaticInitf07e6bf6487a19c1ad4a7f66aa2be118
     );
 
     public static $classMap = array (
+        'Composer\\InstalledVersions' => __DIR__ . '/..' . '/composer/InstalledVersions.php',
         'PEAR_Exception' => __DIR__ . '/..' . '/pear/pear_exception/PEAR/Exception.php',
         'PHP_ICO' => __DIR__ . '/..' . '/chrisjean/php-ico/class-php-ico.php',
     );
diff --git a/wcfsetup/install/files/lib/system/api/composer/installed.json b/wcfsetup/install/files/lib/system/api/composer/installed.json
index 885dba7ccbe..eb791ec8488 100644
--- a/wcfsetup/install/files/lib/system/api/composer/installed.json
+++ b/wcfsetup/install/files/lib/system/api/composer/installed.json
@@ -1,1033 +1,1054 @@
-[
-    {
-        "name": "chrisjean/php-ico",
-        "version": "1.0.4",
-        "version_normalized": "1.0.4.0",
-        "source": {
-            "type": "git",
-            "url": "https://github.com/chrisbliss18/php-ico.git",
-            "reference": "ccd5c0d56554f3ddcd7a823e695be83e0d1e43b6"
-        },
-        "dist": {
-            "type": "zip",
-            "url": "https://api.github.com/repos/chrisbliss18/php-ico/zipball/ccd5c0d56554f3ddcd7a823e695be83e0d1e43b6",
-            "reference": "ccd5c0d56554f3ddcd7a823e695be83e0d1e43b6",
-            "shasum": ""
-        },
-        "require": {
-            "ext-gd": "*",
-            "php": ">=5.2.4"
-        },
-        "time": "2016-09-27T22:00:56+00:00",
-        "type": "library",
-        "installation-source": "dist",
-        "autoload": {
-            "classmap": [
-                "class-php-ico.php"
-            ]
-        },
-        "notification-url": "https://packagist.org/downloads/",
-        "license": [
-            "GPL-2.0+"
-        ],
-        "authors": [
-            {
-                "name": "Chris Jean",
-                "homepage": "https://chrisjean.com",
-                "role": "Developer"
-            }
-        ],
-        "description": "An easy-to-use library to generate valid ICO files.",
-        "homepage": "https://github.com/chrisbliss18/php-ico",
-        "keywords": [
-            "favicon",
-            "ico"
-        ]
-    },
-    {
-        "name": "erusev/parsedown",
-        "version": "1.7.4",
-        "version_normalized": "1.7.4.0",
-        "source": {
-            "type": "git",
-            "url": "https://github.com/erusev/parsedown.git",
-            "reference": "cb17b6477dfff935958ba01325f2e8a2bfa6dab3"
-        },
-        "dist": {
-            "type": "zip",
-            "url": "https://api.github.com/repos/erusev/parsedown/zipball/cb17b6477dfff935958ba01325f2e8a2bfa6dab3",
-            "reference": "cb17b6477dfff935958ba01325f2e8a2bfa6dab3",
-            "shasum": ""
-        },
-        "require": {
-            "ext-mbstring": "*",
-            "php": ">=5.3.0"
-        },
-        "require-dev": {
-            "phpunit/phpunit": "^4.8.35"
-        },
-        "time": "2019-12-30T22:54:17+00:00",
-        "type": "library",
-        "installation-source": "dist",
-        "autoload": {
-            "psr-0": {
-                "Parsedown": ""
-            }
-        },
-        "notification-url": "https://packagist.org/downloads/",
-        "license": [
-            "MIT"
-        ],
-        "authors": [
-            {
-                "name": "Emanuil Rusev",
-                "email": "hello@erusev.com",
-                "homepage": "http://erusev.com"
-            }
-        ],
-        "description": "Parser for Markdown.",
-        "homepage": "http://parsedown.org",
-        "keywords": [
-            "markdown",
-            "parser"
-        ]
-    },
-    {
-        "name": "ezyang/htmlpurifier",
-        "version": "v4.12.0",
-        "version_normalized": "4.12.0.0",
-        "source": {
-            "type": "git",
-            "url": "https://github.com/ezyang/htmlpurifier.git",
-            "reference": "a617e55bc62a87eec73bd456d146d134ad716f03"
-        },
-        "dist": {
-            "type": "zip",
-            "url": "https://api.github.com/repos/ezyang/htmlpurifier/zipball/a617e55bc62a87eec73bd456d146d134ad716f03",
-            "reference": "a617e55bc62a87eec73bd456d146d134ad716f03",
-            "shasum": ""
-        },
-        "require": {
-            "php": ">=5.2"
-        },
-        "require-dev": {
-            "simpletest/simpletest": "dev-master#72de02a7b80c6bb8864ef9bf66d41d2f58f826bd"
-        },
-        "time": "2019-10-28T03:44:26+00:00",
-        "type": "library",
-        "installation-source": "dist",
-        "autoload": {
-            "psr-0": {
-                "HTMLPurifier": "library/"
-            },
-            "files": [
-                "library/HTMLPurifier.composer.php"
-            ]
-        },
-        "notification-url": "https://packagist.org/downloads/",
-        "license": [
-            "LGPL-2.1-or-later"
-        ],
-        "authors": [
-            {
-                "name": "Edward Z. Yang",
-                "email": "admin@htmlpurifier.org",
-                "homepage": "http://ezyang.com"
-            }
-        ],
-        "description": "Standards compliant HTML filter written in PHP",
-        "homepage": "http://htmlpurifier.org/",
-        "keywords": [
-            "html"
-        ]
-    },
-    {
-        "name": "guzzlehttp/guzzle",
-        "version": "dev-6.5-windows",
-        "version_normalized": "dev-6.5-windows",
-        "source": {
-            "type": "git",
-            "url": "https://github.com/WoltLab/guzzle",
-            "reference": "40e0ba7d933ec47237adb4f35ba363c3d8ffe453"
-        },
-        "dist": {
-            "type": "zip",
-            "url": "https://api.github.com/repos/WoltLab/guzzle/zipball/40e0ba7d933ec47237adb4f35ba363c3d8ffe453",
-            "reference": "40e0ba7d933ec47237adb4f35ba363c3d8ffe453",
-            "shasum": ""
-        },
-        "require": {
-            "ext-json": "*",
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+                }
+            },
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+            "autoload": {
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+                }
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "authors": [
+                {
+                    "name": "John Reeve",
+                    "email": "jreeve@pelagodesign.com"
+                },
+                {
+                    "name": "Cameron Brooks"
+                },
+                {
+                    "name": "Jaime Prado"
+                },
+                {
+                    "name": "Oliver Klee",
+                    "email": "github@oliverklee.de"
+                },
+                {
+                    "name": "Zoli Szabó",
+                    "email": "zoli.szabo+github@gmail.com"
+                },
+                {
+                    "name": "Jake Hotson",
+                    "email": "jake@qzdesign.co.uk"
+                }
+            ],
+            "description": "Converts CSS styles into inline style attributes in your HTML code",
+            "homepage": "https://www.myintervals.com/emogrifier.php",
+            "keywords": [
+                "css",
+                "email",
+                "pre-processing"
+            ],
+            "install-path": "../pelago/emogrifier"
+        },
+        {
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+            "version": "1.0.1",
+            "version_normalized": "1.0.1.0",
+            "source": {
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+                "reference": "f6561bf28d520154e4b0ec72be95418abe6d9363",
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+            "time": "2016-08-06T14:39:51+00:00",
+            "type": "library",
+            "extra": {
+                "branch-alias": {
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+            },
+            "installation-source": "dist",
+            "autoload": {
+                "psr-4": {
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+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
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+            "authors": [
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+                }
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+            "description": "Common interface for HTTP messages",
+            "homepage": "https://github.com/php-fig/http-message",
+            "keywords": [
+                "http",
+                "http-message",
+                "psr",
+                "psr-7",
+                "request",
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+            "install-path": "../psr/http-message"
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+        {
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+            "version_normalized": "3.0.3.0",
+            "source": {
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+            },
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+            "type": "library",
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+            "autoload": {
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+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
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+            "authors": [
+                {
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+                    "email": "ralph.khattar@gmail.com"
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+            "description": "A polyfill for getallheaders.",
+            "install-path": "../ralouphie/getallheaders"
+        },
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+            "version": "1.3",
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+            "source": {
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+                "reference": "261cd018025d5790e135a1e5b694d6af186e6bca"
+            },
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+                "shasum": ""
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+            "bin": [
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+            "autoload": {
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+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "authors": [
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+                    "email": "apang@softwaredevelopment.ca",
+                    "homepage": "https://github.com/robocoder"
+                },
+                {
+                    "name": "Cédric Morin",
+                    "email": "cedric@yterium.com",
+                    "homepage": "https://github.com/Cerdic"
+                }
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+            "description": "scssphp is a compiler for SCSS written in PHP.",
+            "homepage": "http://scssphp.github.io/scssphp/",
+            "keywords": [
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+                "less",
+                "sass",
+                "scss",
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+            "version_normalized": "3.4.42.0",
+            "source": {
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+                "reference": "9ccf6e78077a3fc1596e6c7b5958008965a11518"
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+            "dist": {
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+                "shasum": ""
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+            },
+            "time": "2020-03-16T08:31:04+00:00",
+            "type": "library",
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+            "autoload": {
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+                    "Symfony\\Component\\CssSelector\\": ""
+                },
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+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
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+                    "name": "Fabien Potencier",
+                    "email": "fabien@symfony.com"
+                },
+                {
+                    "name": "Jean-François Simon",
+                    "email": "jeanfrancois.simon@sensiolabs.com"
+                },
+                {
+                    "name": "Symfony Community",
+                    "homepage": "https://symfony.com/contributors"
+                }
+            ],
+            "description": "Symfony CssSelector Component",
+            "homepage": "https://symfony.com",
+            "funding": [
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+                    "url": "https://symfony.com/sponsor",
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+                    "type": "github"
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+            "version": "v1.17.1",
+            "version_normalized": "1.17.1.0",
+            "source": {
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+                "shasum": ""
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+                "symfony/polyfill-mbstring": "^1.3",
+                "symfony/polyfill-php72": "^1.10"
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+            "suggest": {
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+            "time": "2020-06-06T08:46:27+00:00",
+            "type": "library",
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+                "thanks": {
+                    "name": "symfony/polyfill",
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+            "autoload": {
+                "psr-4": {
+                    "Symfony\\Polyfill\\Intl\\Idn\\": ""
+                },
+                "files": [
+                    "bootstrap.php"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "authors": [
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+                    "name": "Laurent Bassin",
+                    "email": "laurent@bassin.info"
+                },
+                {
+                    "name": "Symfony Community",
+                    "homepage": "https://symfony.com/contributors"
+                }
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+            "description": "Symfony polyfill for intl's idn_to_ascii and idn_to_utf8 functions",
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+            "keywords": [
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+                "idn",
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+                "shim"
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+            "version_normalized": "1.17.1.0",
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+            "type": "library",
+            "extra": {
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+            },
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+            "license": [
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+                    "email": "p@tchwork.com"
+                },
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+                    "homepage": "https://symfony.com/contributors"
+                }
+            ],
+            "description": "Symfony polyfill for the Mbstring extension",
+            "homepage": "https://symfony.com",
+            "keywords": [
+                "compatibility",
+                "mbstring",
+                "polyfill",
+                "portable",
+                "shim"
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+            "funding": [
+                {
+                    "url": "https://symfony.com/sponsor",
+                    "type": "custom"
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+                    "type": "github"
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+                {
+                    "url": "https://tidelift.com/funding/github/packagist/symfony/symfony",
+                    "type": "tidelift"
+                }
+            ],
+            "install-path": "../symfony/polyfill-mbstring"
+        },
+        {
+            "name": "symfony/polyfill-php72",
+            "version": "v1.17.0",
+            "version_normalized": "1.17.0.0",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/symfony/polyfill-php72.git",
+                "reference": "f048e612a3905f34931127360bdd2def19a5e582"
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+            "dist": {
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+                "url": "https://api.github.com/repos/symfony/polyfill-php72/zipball/f048e612a3905f34931127360bdd2def19a5e582",
+                "reference": "f048e612a3905f34931127360bdd2def19a5e582",
+                "shasum": ""
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+            "require": {
+                "php": ">=5.3.3"
+            },
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+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "1.17-dev"
+                }
+            },
+            "installation-source": "dist",
+            "autoload": {
+                "psr-4": {
+                    "Symfony\\Polyfill\\Php72\\": ""
+                },
+                "files": [
+                    "bootstrap.php"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "authors": [
+                {
+                    "name": "Nicolas Grekas",
+                    "email": "p@tchwork.com"
+                },
+                {
+                    "name": "Symfony Community",
+                    "homepage": "https://symfony.com/contributors"
+                }
+            ],
+            "description": "Symfony polyfill backporting some PHP 7.2+ features to lower PHP versions",
+            "homepage": "https://symfony.com",
+            "keywords": [
+                "compatibility",
+                "polyfill",
+                "portable",
+                "shim"
+            ],
+            "funding": [
+                {
+                    "url": "https://symfony.com/sponsor",
+                    "type": "custom"
+                },
+                {
+                    "url": "https://github.com/fabpot",
+                    "type": "github"
+                },
+                {
+                    "url": "https://tidelift.com/funding/github/packagist/symfony/symfony",
+                    "type": "tidelift"
+                }
+            ],
+            "install-path": "../symfony/polyfill-php72"
+        },
+        {
+            "name": "true/punycode",
+            "version": "v2.1.1",
+            "version_normalized": "2.1.1.0",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/true/php-punycode.git",
+                "reference": "a4d0c11a36dd7f4e7cd7096076cab6d3378a071e"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/true/php-punycode/zipball/a4d0c11a36dd7f4e7cd7096076cab6d3378a071e",
+                "reference": "a4d0c11a36dd7f4e7cd7096076cab6d3378a071e",
+                "shasum": ""
+            },
+            "require": {
+                "php": ">=5.3.0",
+                "symfony/polyfill-mbstring": "^1.3"
+            },
+            "require-dev": {
+                "phpunit/phpunit": "~4.7",
+                "squizlabs/php_codesniffer": "~2.0"
+            },
+            "time": "2016-11-16T10:37:54+00:00",
+            "type": "library",
+            "installation-source": "dist",
+            "autoload": {
+                "psr-4": {
+                    "TrueBV\\": "src/"
+                }
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "authors": [
+                {
+                    "name": "Renan Gonçalves",
+                    "email": "renan.saddam@gmail.com"
+                }
+            ],
+            "description": "A Bootstring encoding of Unicode for Internationalized Domain Names in Applications (IDNA)",
+            "homepage": "https://github.com/true/php-punycode",
+            "keywords": [
+                "idna",
+                "punycode"
+            ],
+            "install-path": "../true/punycode"
+        }
+    ],
+    "dev": false,
+    "dev-package-names": []
+}
diff --git a/wcfsetup/install/files/lib/system/api/composer/installed.php b/wcfsetup/install/files/lib/system/api/composer/installed.php
new file mode 100644
index 00000000000..c5bcebb332b
--- /dev/null
+++ b/wcfsetup/install/files/lib/system/api/composer/installed.php
@@ -0,0 +1,184 @@
+<?php return array (
+  'root' => 
+  array (
+    'pretty_version' => '1.0.0+no-version-set',
+    'version' => '1.0.0.0',
+    'aliases' => 
+    array (
+    ),
+    'reference' => NULL,
+    'name' => '__root__',
+  ),
+  'versions' => 
+  array (
+    '__root__' => 
+    array (
+      'pretty_version' => '1.0.0+no-version-set',
+      'version' => '1.0.0.0',
+      'aliases' => 
+      array (
+      ),
+      'reference' => NULL,
+    ),
+    'chrisjean/php-ico' => 
+    array (
+      'pretty_version' => '1.0.4',
+      'version' => '1.0.4.0',
+      'aliases' => 
+      array (
+      ),
+      'reference' => 'ccd5c0d56554f3ddcd7a823e695be83e0d1e43b6',
+    ),
+    'erusev/parsedown' => 
+    array (
+      'pretty_version' => '1.7.4',
+      'version' => '1.7.4.0',
+      'aliases' => 
+      array (
+      ),
+      'reference' => 'cb17b6477dfff935958ba01325f2e8a2bfa6dab3',
+    ),
+    'ezyang/htmlpurifier' => 
+    array (
+      'pretty_version' => 'v4.12.0',
+      'version' => '4.12.0.0',
+      'aliases' => 
+      array (
+      ),
+      'reference' => 'a617e55bc62a87eec73bd456d146d134ad716f03',
+    ),
+    'guzzlehttp/guzzle' => 
+    array (
+      'pretty_version' => 'dev-6.5-woltlab',
+      'version' => 'dev-6.5-woltlab',
+      'aliases' => 
+      array (
+      ),
+      'reference' => '6298db12d08c3c65c80971bb1b9f6f98e8a43c35',
+    ),
+    'guzzlehttp/promises' => 
+    array (
+      'pretty_version' => 'v1.3.1',
+      'version' => '1.3.1.0',
+      'aliases' => 
+      array (
+      ),
+      'reference' => 'a59da6cf61d80060647ff4d3eb2c03a2bc694646',
+    ),
+    'guzzlehttp/psr7' => 
+    array (
+      'pretty_version' => '1.6.1',
+      'version' => '1.6.1.0',
+      'aliases' => 
+      array (
+      ),
+      'reference' => '239400de7a173fe9901b9ac7c06497751f00727a',
+    ),
+    'pear/net_idna2' => 
+    array (
+      'pretty_version' => 'v0.2.0',
+      'version' => '0.2.0.0',
+      'aliases' => 
+      array (
+      ),
+      'reference' => '51734eaf8be2df58e8aad5835b9966459b2fb37c',
+    ),
+    'pear/pear_exception' => 
+    array (
+      'pretty_version' => 'v1.0.1',
+      'version' => '1.0.1.0',
+      'aliases' => 
+      array (
+      ),
+      'reference' => 'dbb42a5a0e45f3adcf99babfb2a1ba77b8ac36a7',
+    ),
+    'pelago/emogrifier' => 
+    array (
+      'pretty_version' => 'v2.1.1',
+      'version' => '2.1.1.0',
+      'aliases' => 
+      array (
+      ),
+      'reference' => '8ee7fb5ad772915451ed3415c1992bd3697d4983',
+    ),
+    'psr/http-message' => 
+    array (
+      'pretty_version' => '1.0.1',
+      'version' => '1.0.1.0',
+      'aliases' => 
+      array (
+      ),
+      'reference' => 'f6561bf28d520154e4b0ec72be95418abe6d9363',
+    ),
+    'psr/http-message-implementation' => 
+    array (
+      'provided' => 
+      array (
+        0 => '1.0',
+      ),
+    ),
+    'ralouphie/getallheaders' => 
+    array (
+      'pretty_version' => '3.0.3',
+      'version' => '3.0.3.0',
+      'aliases' => 
+      array (
+      ),
+      'reference' => '120b605dfeb996808c31b6477290a714d356e822',
+    ),
+    'scssphp/scssphp' => 
+    array (
+      'pretty_version' => '1.3',
+      'version' => '1.3.0.0',
+      'aliases' => 
+      array (
+      ),
+      'reference' => '261cd018025d5790e135a1e5b694d6af186e6bca',
+    ),
+    'symfony/css-selector' => 
+    array (
+      'pretty_version' => 'v3.4.42',
+      'version' => '3.4.42.0',
+      'aliases' => 
+      array (
+      ),
+      'reference' => '9ccf6e78077a3fc1596e6c7b5958008965a11518',
+    ),
+    'symfony/polyfill-intl-idn' => 
+    array (
+      'pretty_version' => 'v1.17.1',
+      'version' => '1.17.1.0',
+      'aliases' => 
+      array (
+      ),
+      'reference' => 'a57f8161502549a742a63c09f0a604997bf47027',
+    ),
+    'symfony/polyfill-mbstring' => 
+    array (
+      'pretty_version' => 'v1.17.1',
+      'version' => '1.17.1.0',
+      'aliases' => 
+      array (
+      ),
+      'reference' => '7110338d81ce1cbc3e273136e4574663627037a7',
+    ),
+    'symfony/polyfill-php72' => 
+    array (
+      'pretty_version' => 'v1.17.0',
+      'version' => '1.17.0.0',
+      'aliases' => 
+      array (
+      ),
+      'reference' => 'f048e612a3905f34931127360bdd2def19a5e582',
+    ),
+    'true/punycode' => 
+    array (
+      'pretty_version' => 'v2.1.1',
+      'version' => '2.1.1.0',
+      'aliases' => 
+      array (
+      ),
+      'reference' => 'a4d0c11a36dd7f4e7cd7096076cab6d3378a071e',
+    ),
+  ),
+);
diff --git a/wcfsetup/install/files/lib/system/api/composer/platform_check.php b/wcfsetup/install/files/lib/system/api/composer/platform_check.php
new file mode 100644
index 00000000000..8b379f44696
--- /dev/null
+++ b/wcfsetup/install/files/lib/system/api/composer/platform_check.php
@@ -0,0 +1,26 @@
+<?php
+
+// platform_check.php @generated by Composer
+
+$issues = array();
+
+if (!(PHP_VERSION_ID >= 50600)) {
+    $issues[] = 'Your Composer dependencies require a PHP version ">= 5.6.0". You are running ' . PHP_VERSION . '.';
+}
+
+if ($issues) {
+    if (!headers_sent()) {
+        header('HTTP/1.1 500 Internal Server Error');
+    }
+    if (!ini_get('display_errors')) {
+        if (PHP_SAPI === 'cli' || PHP_SAPI === 'phpdbg') {
+            fwrite(STDERR, 'Composer detected issues in your platform:' . PHP_EOL.PHP_EOL . implode(PHP_EOL, $issues) . PHP_EOL.PHP_EOL);
+        } elseif (!headers_sent()) {
+            echo 'Composer detected issues in your platform:' . PHP_EOL.PHP_EOL . str_replace('You are running '.PHP_VERSION.'.', '', implode(PHP_EOL, $issues)) . PHP_EOL.PHP_EOL;
+        }
+    }
+    trigger_error(
+        'Composer detected issues in your platform: ' . implode(' ', $issues),
+        E_USER_ERROR
+    );
+}
diff --git a/wcfsetup/install/files/lib/system/api/guzzlehttp/guzzle/src/Handler/StreamHandler.php b/wcfsetup/install/files/lib/system/api/guzzlehttp/guzzle/src/Handler/StreamHandler.php
index a15734a44de..03429ee8b84 100644
--- a/wcfsetup/install/files/lib/system/api/guzzlehttp/guzzle/src/Handler/StreamHandler.php
+++ b/wcfsetup/install/files/lib/system/api/guzzlehttp/guzzle/src/Handler/StreamHandler.php
@@ -407,8 +407,10 @@ private function getDefaultContext(RequestInterface $request)
 
     private function add_proxy(RequestInterface $request, &$options, $value, &$params)
     {
+        $uri = null;
+
         if (!is_array($value)) {
-            $options['http']['proxy'] = $value;
+            $uri = $value;
         } else {
             $scheme = $request->getUri()->getScheme();
             if (isset($value[$scheme])) {
@@ -418,10 +420,49 @@ private function add_proxy(RequestInterface $request, &$options, $value, &$param
                         $value['no']
                     )
                 ) {
-                    $options['http']['proxy'] = $value[$scheme];
+                    $uri = $value[$scheme];
+                }
+            }
+        }
+
+        if (!$uri) {
+            return;
+        }
+
+        $parsed = $this->parse_proxy($uri);
+        $options['http']['proxy'] = $parsed['proxy'];
+
+        if ($parsed['auth']) {
+            if (!isset($options['http']['header'])) {
+                $options['http']['header'] = [];
+            }
+            $options['http']['header'] .= "\r\nProxy-Authorization: {$parsed['auth']}";
+        }
+    }
+
+    private function parse_proxy($url)
+    {
+        $parsed = \parse_url($url);
+
+        if ($parsed !== false && isset($parsed['scheme']) && $parsed['scheme'] === 'http') {
+            if (isset($parsed['host']) && isset($parsed['port'])) {
+                $auth = null;
+                if (isset($parsed['user']) && isset($parsed['pass'])) {
+                    $auth = \base64_encode("{$parsed['user']}:{$parsed['pass']}");
                 }
+
+                return [
+                    'proxy' => "tcp://{$parsed['host']}:{$parsed['port']}",
+                    'auth' => $auth ? "Basic {$auth}" : null,
+                ];
             }
         }
+
+        // Return proxy as-is.
+        return [
+            'proxy' => $url,
+            'auth' => null,
+        ];
     }
 
     private function add_timeout(RequestInterface $request, &$options, $value, &$params)