diff --git a/core/includes/update.inc b/core/includes/update.inc
index a9d8449..40cae92 100644
--- a/core/includes/update.inc
+++ b/core/includes/update.inc
@@ -101,6 +101,9 @@ function update_prepare_d8_bootstrap() {
       ),
     );
     if ($has_required_schema) {
+      // Rebuild module list.
+      update_system_rebuild_module_data();
+
       // Update the environment for the language bootstrap if needed.
       update_prepare_d8_language();
     }
@@ -777,5 +780,101 @@ function update_retrieve_dependencies() {
  */
 
 /**
+ * Rebuild, save, and return data about all currently available modules.
+ *
+ * @return
+ *   Array of all available modules and their data.
+ *
+ * @see system_rebuild_module_data()
+ */
+function update_system_rebuild_module_data() {
+  $modules = _update_system_rebuild_module_data();
+  ksort($modules);
+  system_get_files_database($modules, 'module');
+  system_update_files_database($modules, 'module');
+  return _module_build_dependencies($modules);
+}
+
+/**
+ * Helper function to scan and collect module .info data.
+ *
+ * @return
+ *   An associative array of module information.
+ *
+ * @see _system_rebuild_module_data()
+ */
+function _update_system_rebuild_module_data() {
+  // Find modules
+  $modules = drupal_system_listing('/^' . DRUPAL_PHP_FUNCTION_PATTERN . '\.module$/', 'modules', 'name', 0);
+
+  // Include the install profile in modules that are loaded.
+  $profile = drupal_get_profile();
+  $modules[$profile] = new stdClass();
+  $modules[$profile]->name = $profile;
+  $modules[$profile]->uri = 'profiles/' . $profile . '/' . $profile . '.profile';
+  $modules[$profile]->filename = $profile . '.profile';
+
+  // Install profile hooks are always executed last.
+  $modules[$profile]->weight = 1000;
+
+  // Set defaults for module info.
+  $defaults = array(
+    'dependencies' => array(),
+    'description' => '',
+    'package' => 'Other',
+    'version' => NULL,
+    'php' => DRUPAL_MINIMUM_PHP,
+    'files' => array(),
+    'bootstrap' => 0,
+  );
+
+  // Read info files for each module.
+  foreach ($modules as $key => $module) {
+    // The module system uses the key 'filename' instead of 'uri' so copy the
+    // value so it will be used by the modules system.
+    $modules[$key]->filename = $module->uri;
+
+    // Look for the info file.
+    $module->info = drupal_parse_info_file(dirname($module->uri) . '/' . $module->name . '.info');
+
+    // Skip modules that don't provide info.
+    if (empty($module->info)) {
+      unset($modules[$key]);
+      continue;
+    }
+
+    // Merge in defaults and save.
+    $modules[$key]->info = $module->info + $defaults;
+
+    // Prefix stylesheets and scripts with module path.
+    $path = dirname($module->uri);
+    if (isset($module->info['stylesheets'])) {
+      $module->info['stylesheets'] = _system_info_add_path($module->info['stylesheets'], $path);
+    }
+    if (isset($module->info['scripts'])) {
+      $module->info['scripts'] = _system_info_add_path($module->info['scripts'], $path);
+    }
+
+    // Install profiles are hidden by default, unless explicitly specified
+    // otherwise in the .info file.
+    if ($key == $profile && !isset($modules[$key]->info['hidden'])) {
+      $modules[$key]->info['hidden'] = TRUE;
+    }
+  }
+
+  if (isset($modules[$profile])) {
+    // The install profile is required, if it's a valid module.
+    $modules[$profile]->info['required'] = TRUE;
+    // Add a default distribution name if the profile did not provide one. This
+    // matches the default value used in install_profile_info().
+    if (!isset($modules[$profile]->info['distribution_name'])) {
+      $modules[$profile]->info['distribution_name'] = 'Drupal';
+    }
+  }
+
+  return $modules;
+}
+
+/**
  * @} End of "defgroup update-api-7.x-to-8.x"
  */
diff --git a/core/update.php b/core/update.php
index d1a0940..36f7a44 100644
--- a/core/update.php
+++ b/core/update.php
@@ -359,6 +359,8 @@ require_once DRUPAL_ROOT . '/core/includes/update.inc';
 require_once DRUPAL_ROOT . '/core/includes/common.inc';
 require_once DRUPAL_ROOT . '/core/includes/file.inc';
 require_once DRUPAL_ROOT . '/core/includes/unicode.inc';
+require_once DRUPAL_ROOT . '/core/includes/module.inc';
+require_once DRUPAL_ROOT . '/core/modules/system/system.module';
 update_prepare_d8_bootstrap();
 
 // Determine if the current user has access to run update.php.