> For the complete documentation index, see [llms.txt](https://docs.coherence.io/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.coherence.io/2.3/support/upgrading-unity-sdk/upgrade-2.1-greater-than-2.2.md).

# Upgrade 2.1 -> 2.2

## <mark style="color:yellow;">Breaking:</mark> CoherenceInputSimulation method visibility

Starting from 2.2, the core `CoherenceInputSimulation` simulation methods are public instead of protected. This allows external systems, such as replay tooling, to control input simulation directly.

If your project has a class that inherits from `CoherenceInputSimulation`, update these method overrides from `protected` to `public`:

```csharp
public override void SetInputs(CoherenceClientConnection client)
public override void Simulate(long simulationFrame)
public override void Rollback(long toFrame, TState state)
public override TState CreateState()
```

Replace `TState` with the simulation state type used by your implementation.

For example:

```csharp
// Before
protected override void Simulate(long simulationFrame)
{
    ...
}

// After
public override void Simulate(long simulationFrame)
{
    ...
}
```


---

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