diff --git a/wp-includes/class-wp-oembed.php b/wp-includes/class-wp-oembed.php
index 1c10f44489..881de68103 100644
--- a/wp-includes/class-wp-oembed.php
+++ b/wp-includes/class-wp-oembed.php
@@ -597,13 +597,23 @@ class WP_oEmbed {
 			return false;
 		}
 
-		$loader = libxml_disable_entity_loader( true );
+		if ( PHP_VERSION_ID < 80000 ) {
+			// This function has been deprecated in PHP 8.0 because in libxml 2.9.0, external entity loading
+			// is disabled by default, so this function is no longer needed to protect against XXE attacks.
+			// phpcs:ignore PHPCompatibility.FunctionUse.RemovedFunctions.libxml_disable_entity_loaderDeprecated
+			$loader = libxml_disable_entity_loader( true );
+		}
+
 		$errors = libxml_use_internal_errors( true );
 
 		$return = $this->_parse_xml_body( $response_body );
 
 		libxml_use_internal_errors( $errors );
-		libxml_disable_entity_loader( $loader );
+
+		if ( PHP_VERSION_ID < 80000 && isset( $loader ) ) {
+			// phpcs:ignore PHPCompatibility.FunctionUse.RemovedFunctions.libxml_disable_entity_loaderDeprecated
+			libxml_disable_entity_loader( $loader );
+		}
 
 		return $return;
 	}
diff --git a/wp-includes/version.php b/wp-includes/version.php
index 83b6f66802..a3dff7a56d 100644
--- a/wp-includes/version.php
+++ b/wp-includes/version.php
@@ -13,7 +13,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '5.6-alpha-48788';
+$wp_version = '5.6-alpha-48789';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.