# Update()

> Updates the flattened hierarchy and requests a rebuild of the list of HierarchyFlattenedNode from the HierarchyFlattened.Hierarchy topology.

## Definition

* **Type:** Method
* **Namespace:** [Unity.Hierarchy](/engine/6000.6/script-reference/unity/hierarchy.md)
* **Assembly:** UnityEngine.HierarchyCoreModule

```csharp
public void Update()
```