diff --git a/composer.json b/composer.json
index 51762b8409..ff94ef05d7 100644
--- a/composer.json
+++ b/composer.json
@@ -14,6 +14,7 @@
     "require": {
         "ext-json": "*",
         "ext-libxml": "*",
+        "ext-mbstring": "*",
         "ext-pdo": "*",
         "ext-simplexml": "*",
         "ext-xmlreader": "*",
diff --git a/composer.lock b/composer.lock
index 88c8b05fe0..e5bcbda1a1 100644
--- a/composer.lock
+++ b/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": "9e703ab133e8363e26a67dbd639a297c",
+    "content-hash": "fd5e442ed41b3a7ebb1c53c30467e7e7",
     "packages": [],
     "packages-dev": [
         {
@@ -3030,6 +3030,7 @@
     "platform": {
         "ext-json": "*",
         "ext-libxml": "*",
+        "ext-mbstring": "*",
         "ext-pdo": "*",
         "ext-simplexml": "*",
         "ext-xmlreader": "*",
diff --git a/lib/composer/composer/InstalledVersions.php b/lib/composer/composer/InstalledVersions.php
new file mode 100644
index 0000000000..a8a6067367
--- /dev/null
+++ b/lib/composer/composer/InstalledVersions.php
@@ -0,0 +1,299 @@
+<?php
+
+
+
+
+
+
+
+
+
+
+
+namespace Composer;
+
+use Composer\Autoload\ClassLoader;
+use Composer\Semver\VersionParser;
+
+
+
+
+
+
+
+
+class InstalledVersions
+{
+private static $installed = array (
+  'root' => 
+  array (
+    'pretty_version' => 'dev-master',
+    'version' => 'dev-master',
+    'aliases' => 
+    array (
+    ),
+    'reference' => '619b35b480a2d348436156a2a6144895b00b1e07',
+    'name' => '__root__',
+  ),
+  'versions' => 
+  array (
+    '__root__' => 
+    array (
+      'pretty_version' => 'dev-master',
+      'version' => 'dev-master',
+      'aliases' => 
+      array (
+      ),
+      'reference' => '619b35b480a2d348436156a2a6144895b00b1e07',
+    ),
+  ),
+);
+private static $canGetVendors;
+private static $installedByVendor = array();
+
+
+
+
+
+
+
+public static function getInstalledPackages()
+{
+$packages = array();
+foreach (self::getInstalled() as $installed) {
+$packages[] = array_keys($installed['versions']);
+}
+
+if (1 === \count($packages)) {
+return $packages[0];
+}
+
+return array_keys(array_flip(\call_user_func_array('array_merge', $packages)));
+}
+
+
+
+
+
+
+
+
+
+public static function isInstalled($packageName)
+{
+foreach (self::getInstalled() as $installed) {
+if (isset($installed['versions'][$packageName])) {
+return true;
+}
+}
+
+return false;
+}
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+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)
+{
+foreach (self::getInstalled() as $installed) {
+if (!isset($installed['versions'][$packageName])) {
+continue;
+}
+
+$ranges = array();
+if (isset($installed['versions'][$packageName]['pretty_version'])) {
+$ranges[] = $installed['versions'][$packageName]['pretty_version'];
+}
+if (array_key_exists('aliases', $installed['versions'][$packageName])) {
+$ranges = array_merge($ranges, $installed['versions'][$packageName]['aliases']);
+}
+if (array_key_exists('replaced', $installed['versions'][$packageName])) {
+$ranges = array_merge($ranges, $installed['versions'][$packageName]['replaced']);
+}
+if (array_key_exists('provided', $installed['versions'][$packageName])) {
+$ranges = array_merge($ranges, $installed['versions'][$packageName]['provided']);
+}
+
+return implode(' || ', $ranges);
+}
+
+throw new \OutOfBoundsException('Package "' . $packageName . '" is not installed');
+}
+
+
+
+
+
+public static function getVersion($packageName)
+{
+foreach (self::getInstalled() as $installed) {
+if (!isset($installed['versions'][$packageName])) {
+continue;
+}
+
+if (!isset($installed['versions'][$packageName]['version'])) {
+return null;
+}
+
+return $installed['versions'][$packageName]['version'];
+}
+
+throw new \OutOfBoundsException('Package "' . $packageName . '" is not installed');
+}
+
+
+
+
+
+public static function getPrettyVersion($packageName)
+{
+foreach (self::getInstalled() as $installed) {
+if (!isset($installed['versions'][$packageName])) {
+continue;
+}
+
+if (!isset($installed['versions'][$packageName]['pretty_version'])) {
+return null;
+}
+
+return $installed['versions'][$packageName]['pretty_version'];
+}
+
+throw new \OutOfBoundsException('Package "' . $packageName . '" is not installed');
+}
+
+
+
+
+
+public static function getReference($packageName)
+{
+foreach (self::getInstalled() as $installed) {
+if (!isset($installed['versions'][$packageName])) {
+continue;
+}
+
+if (!isset($installed['versions'][$packageName]['reference'])) {
+return null;
+}
+
+return $installed['versions'][$packageName]['reference'];
+}
+
+throw new \OutOfBoundsException('Package "' . $packageName . '" is not installed');
+}
+
+
+
+
+
+public static function getRootPackage()
+{
+$installed = self::getInstalled();
+
+return $installed[0]['root'];
+}
+
+
+
+
+
+
+
+
+public static function getRawData()
+{
+@trigger_error('getRawData only returns the first dataset loaded, which may not be what you expect. Use getAllRawData() instead which returns all datasets for all autoloaders present in the process.', E_USER_DEPRECATED);
+
+return self::$installed;
+}
+
+
+
+
+
+
+
+public static function getAllRawData()
+{
+return self::getInstalled();
+}
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+public static function reload($data)
+{
+self::$installed = $data;
+self::$installedByVendor = array();
+}
+
+
+
+
+
+private static function getInstalled()
+{
+if (null === self::$canGetVendors) {
+self::$canGetVendors = method_exists('Composer\Autoload\ClassLoader', 'getRegisteredLoaders');
+}
+
+$installed = array();
+
+if (self::$canGetVendors) {
+foreach (ClassLoader::getRegisteredLoaders() as $vendorDir => $loader) {
+if (isset(self::$installedByVendor[$vendorDir])) {
+$installed[] = self::$installedByVendor[$vendorDir];
+} elseif (is_file($vendorDir.'/composer/installed.php')) {
+$installed[] = self::$installedByVendor[$vendorDir] = require $vendorDir.'/composer/installed.php';
+}
+}
+}
+
+$installed[] = self::$installed;
+
+return $installed;
+}
+}
diff --git a/lib/composer/composer/autoload_static.php b/lib/composer/composer/autoload_static.php
index 1af3458d99..698cbc3cfa 100644
--- a/lib/composer/composer/autoload_static.php
+++ b/lib/composer/composer/autoload_static.php
@@ -7,7 +7,7 @@ namespace Composer\Autoload;
 class ComposerStaticInit53792487c5a8370acc0b06b1a864ff4c
 {
     public static $prefixLengthsPsr4 = array (
-        'O' =>
+        'O' => 
         array (
             'OC\\Core\\' => 8,
             'OC\\' => 3,
@@ -16,15 +16,15 @@ class ComposerStaticInit53792487c5a8370acc0b06b1a864ff4c
     );
 
     public static $prefixDirsPsr4 = array (
-        'OC\\Core\\' =>
+        'OC\\Core\\' => 
         array (
             0 => __DIR__ . '/../../..' . '/core',
         ),
-        'OC\\' =>
+        'OC\\' => 
         array (
             0 => __DIR__ . '/../../..' . '/lib/private',
         ),
-        'OCP\\' =>
+        'OCP\\' => 
         array (
             0 => __DIR__ . '/../../..' . '/lib/public',
         ),
diff --git a/lib/composer/composer/installed.php b/lib/composer/composer/installed.php
new file mode 100644
index 0000000000..08d6e91e11
--- /dev/null
+++ b/lib/composer/composer/installed.php
@@ -0,0 +1,24 @@
+<?php return array (
+  'root' => 
+  array (
+    'pretty_version' => 'dev-master',
+    'version' => 'dev-master',
+    'aliases' => 
+    array (
+    ),
+    'reference' => '619b35b480a2d348436156a2a6144895b00b1e07',
+    'name' => '__root__',
+  ),
+  'versions' => 
+  array (
+    '__root__' => 
+    array (
+      'pretty_version' => 'dev-master',
+      'version' => 'dev-master',
+      'aliases' => 
+      array (
+      ),
+      'reference' => '619b35b480a2d348436156a2a6144895b00b1e07',
+    ),
+  ),
+);