diff --git a/core/lib/Drupal/Core/Database/Driver/mysql/Connection.php b/core/lib/Drupal/Core/Database/Driver/mysql/Connection.php
index 128780f..d0e273e 100644
--- a/core/lib/Drupal/Core/Database/Driver/mysql/Connection.php
+++ b/core/lib/Drupal/Core/Database/Driver/mysql/Connection.php
@@ -63,8 +63,6 @@ public function __construct(array $connection_options = array()) {
     $connection_options['pdo'] += array(
       // So we don't have to mess around with cursors and unbuffered queries by default.
       PDO::MYSQL_ATTR_USE_BUFFERED_QUERY => TRUE,
-      // Because MySQL's prepared statements skip the query cache, because it's dumb.
-      PDO::ATTR_EMULATE_PREPARES => TRUE,
     );
 
     parent::__construct($dsn, $connection_options['username'], $connection_options['password'], $connection_options['pdo']);
diff --git a/core/lib/Drupal/Core/Database/Driver/mysql/Install/Tasks.php b/core/lib/Drupal/Core/Database/Driver/mysql/Install/Tasks.php
index 0f09aae..01cae17 100644
--- a/core/lib/Drupal/Core/Database/Driver/mysql/Install/Tasks.php
+++ b/core/lib/Drupal/Core/Database/Driver/mysql/Install/Tasks.php
@@ -34,7 +34,7 @@ public function name() {
    * Returns the minimum version for MySQL.
    */
   public function minimumVersion() {
-    return '5.0.15';
+    return '5.1.21';
   }
 
   /**