> ## Documentation Index
> Fetch the complete documentation index at: https://docs.cosmos.network/llms.txt
> Use this file to discover all available pages before exploring further.

# IBC-Go v11.0 to v11.1

> This guide provides instructions for migrating from ibc-go v11.0 to v11.1.

This guide assumes that your chain is already using ibc-go v11.0 and is upgrading to ibc-go v11.1. If you are upgrading directly from ibc-go v10 to ibc-go v11.1, see the [migration guide for v10 to v11](/ibc/next/migrations/v10-to-v11).

## Packet Forward Middleware

Packet Forward Middleware (PFM) has been moved from [cosmos/ibc-apps](https://github.com/cosmos/ibc-apps) to ibc-go in this release. PFM is now available under `modules/apps/packet-forward-middleware`.

This guide assumes that your chain has not previously integrated PFM from ibc-apps. If your chain already uses PFM from ibc-apps, follow the [migration guide for v10 to v11](/ibc/next/migrations/v10-to-v11), which includes guidance for preserving existing PFM state.

If you want to enable PFM, first follow the [integration instructions](/ibc/next/middleware/packet-forward-middleware/integration).

### Add `StoreUpgrades` for the PFM module

If PFM is being added to an existing chain, you must [manually add store upgrades](https://docs.cosmos.network/sdk/latest/guides/upgrades/upgrade#adding-new-modules-during-an-upgrade) for the new PFM module and configure the store loader to apply those upgrades in `app.go`:

```go theme={"theme":{"light":"github-light-high-contrast","dark":"github-dark-high-contrast"}}
if upgradeInfo.Name == "v11_1" && !app.UpgradeKeeper.IsSkipHeight(upgradeInfo.Height) {
  storeUpgrades := store.StoreUpgrades{
    Added: []string{packetforwardtypes.StoreKey},
  }

  app.SetStoreLoader(upgradetypes.UpgradeStoreLoader(upgradeInfo.Height, &storeUpgrades))
}
```

This ensures that the new module's stores are added to the multistore before the migrations begin.
If a chain does not integrate PFM, it does not need to add the PFM key to the `Added` field.

<Note>
  The PFM module name and store key intentionally preserve the original `packetfowardmiddleware` spelling for compatibility with the legacy implementation.
</Note>