diff --git a/wp-includes/rest-api.php b/wp-includes/rest-api.php
index 653abc0c8d..417b8ddada 100644
--- a/wp-includes/rest-api.php
+++ b/wp-includes/rest-api.php
@@ -588,9 +588,9 @@ function rest_send_cors_headers( $value ) {
 		header( 'Access-Control-Allow-Origin: ' . $origin );
 		header( 'Access-Control-Allow-Methods: OPTIONS, GET, POST, PUT, PATCH, DELETE' );
 		header( 'Access-Control-Allow-Credentials: true' );
-		header( 'Vary: Origin' );
+		header( 'Vary: Origin', false );
 	} elseif ( ! headers_sent() && 'GET' === $_SERVER['REQUEST_METHOD'] && ! is_user_logged_in() ) {
-		header( 'Vary: Origin' );
+		header( 'Vary: Origin', false );
 	}
 
 	return $value;
diff --git a/wp-includes/version.php b/wp-includes/version.php
index 7b7994f31c..f0db0e0fc2 100644
--- a/wp-includes/version.php
+++ b/wp-includes/version.php
@@ -13,7 +13,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '5.3-beta3-46543';
+$wp_version = '5.3-beta3-46544';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.