diff --git a/wp-includes/rest-api/endpoints/class-wp-rest-posts-controller.php b/wp-includes/rest-api/endpoints/class-wp-rest-posts-controller.php
index 4aa893e907..dfb97f7b60 100644
--- a/wp-includes/rest-api/endpoints/class-wp-rest-posts-controller.php
+++ b/wp-includes/rest-api/endpoints/class-wp-rest-posts-controller.php
@@ -2039,7 +2039,7 @@ class WP_REST_Posts_Controller extends WP_REST_Controller {
 
 		if ( $post_type_obj->hierarchical && ! empty( $post->post_parent ) ) {
 			$links['up'] = array(
-				'href'       => rest_url( trailingslashit( $base ) . (int) $post->post_parent ),
+				'href'       => rest_url( rest_get_route_for_post( $post->post_parent ) ),
 				'embeddable' => true,
 			);
 		}
diff --git a/wp-includes/version.php b/wp-includes/version.php
index c3d7d22f45..a7e6aa3b5b 100644
--- a/wp-includes/version.php
+++ b/wp-includes/version.php
@@ -16,7 +16,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '5.9-beta2-52362';
+$wp_version = '5.9-beta2-52363';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.