diff --git a/wp-includes/class-wp-oembed.php b/wp-includes/class-wp-oembed.php
index 4226e8163e..2efb890305 100644
--- a/wp-includes/class-wp-oembed.php
+++ b/wp-includes/class-wp-oembed.php
@@ -102,6 +102,7 @@ class WP_oEmbed {
 			'#https?://www\.someecards\.com/usercards/viewcard/.+#i' => array( 'https://www.someecards.com/v2/oembed/', true ),
 			'#https?://some\.ly\/.+#i'                     => array( 'https://www.someecards.com/v2/oembed/', true ),
 			'#https?://(www\.)?tiktok\.com/.*/video/.*#i'  => array( 'https://www.tiktok.com/oembed', true ),
+			'#https?://([a-z]{2}|www)\.pinterest\.com(\.(au|mx))?/.*#i' => array( 'https://www.pinterest.com/oembed.json', true ),
 		);
 
 		if ( ! empty( self::$early_providers['add'] ) ) {
@@ -179,6 +180,7 @@ class WP_oEmbed {
 		 * | Someecards   | some.ly                                   | 4.9.0   |
 		 * | Crowdsignal  | survey.fm                                 | 5.1.0   |
 		 * | TikTok       | tiktok.com                                | 5.4.0   |
+		 * | Pinterest    | pinterest.com                             | 5.9.0   |
 		 *
 		 * No longer supported providers:
 		 *
diff --git a/wp-includes/version.php b/wp-includes/version.php
index 38d76c3b51..4397a6d2e8 100644
--- a/wp-includes/version.php
+++ b/wp-includes/version.php
@@ -16,7 +16,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '5.9-alpha-51820';
+$wp_version = '5.9-alpha-51821';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.