diff --git a/wp-includes/functions.php b/wp-includes/functions.php
index c50711238f..d09bc48e3b 100644
--- a/wp-includes/functions.php
+++ b/wp-includes/functions.php
@@ -2446,6 +2446,7 @@ function wp_get_mime_types() {
 	'dfxp' => 'application/ttaf+xml',
 	// Audio formats.
 	'mp3|m4a|m4b' => 'audio/mpeg',
+	'aac' => 'audio/aac',
 	'ra|ram' => 'audio/x-realaudio',
 	'wav' => 'audio/wav',
 	'ogg|oga' => 'audio/ogg',
diff --git a/wp-includes/version.php b/wp-includes/version.php
index 0b34e81e6d..d5513c83f9 100644
--- a/wp-includes/version.php
+++ b/wp-includes/version.php
@@ -4,7 +4,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '4.9.6-alpha-43134';
+$wp_version = '4.9.6-alpha-43136';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.