diff --git a/src/wp-admin/includes/update-core.php b/src/wp-admin/includes/update-core.php
index 5d4d1a578f..965d4700ff 100644
--- a/src/wp-admin/includes/update-core.php
+++ b/src/wp-admin/includes/update-core.php
@@ -894,6 +894,8 @@ function update_core($from, $to) {
 
 	// Clear the cache to prevent an update_option() from saving a stale db_version to the cache
 	wp_cache_flush();
+	// (Not all cache backends listen to 'flush')
+	wp_cache_delete( 'alloptions', 'options' );
 
 	// Remove working directory
 	$wp_filesystem->delete($from, true);