# Migration Guide (/sdk/v5_3_x/getting-started/migration)

> For the complete documentation index, see [llms.txt](/llms.txt)



<VersionWarning version="5.3.x" />

## SDK 5.1.x => 5.2.x [#sdk-51x--52x]

### Most functions now take an `entryPoint` param [#most-functions-now-take-an-entrypoint-param]

EntryPoint 0.7 is the most recent update to ERC-4337, but we will still be supporting EntryPoint 0.6.

The SDK will automatically use Kernel v3 for EntryPoint 0.7, and Kernel v2 for EntryPoint 0.6.

You will need to specify an `entryPoint` parameter to many functions, including:

* Functions for creating validators, such as `signerToEcdsaValidator`
* Functions for creating Kernel accounts, such as `createKernelAccount`
* Function for creating Kernel client: `createKernelAccountClient`

For example:

```ts
import { ENTRYPOINT_ADDRESS_V06, ENTRYPOINT_ADDRESS_V07 } from "permissionless"

// If migrating a live app
const entryPoint = ENTRYPOINT_ADDRESS_V06

// If launching a new app
const entryPoint = ENTRYPOINT_ADDRESS_V07

const account = await createKernelAccount(publicClient, {
  plugins: {
    sudo: ecdsaValidator,
  },
  entryPoint,
})
```

* If you are migrating a live app that is using EntryPoint 0.6 (Kernel v2), set `entryPoint` to `ENTRYPOINT_ADDRESS_V06`.
* If you are launching a new app, set `entryPoint` to `ENTRYPOINT_ADDRESS_V07`.

### Replaced `transport` with `bundlerTransport` inside `createKernelAccountClient` [#replaced-transport-with-bundlertransport-inside-createkernelaccountclient]

```ts
const kernelClient = createKernelAccountClient({
  transport: http(bundlerUrl), // [!code --]
  bundlerTransport: http(bundlerUrl), // [!code ++]
  // ...
})
```

### Replaced `sponsorUserOperation` with `middleware.sponsorUserOperation` [#replaced-sponsoruseroperation-with-middlewaresponsoruseroperation]

Instead of accepting just a `sponsorUserOperation` middleware, `createSmartAccountClient` now accepts a `middleware` function that can specify a `sponsorUserOperation` function internally, as well as a `gasPrice` function.

```ts
const kernelClient = createKernelAccountClient({
  sponsorUserOperation: paymasterClient.sponsorUserOperation, // [!code --]
  middleware: { // [!code ++]
		sponsorUserOperation: paymasterClient.sponsorUserOperation, // [!code ++]
	}, // [!code ++]
  // ...
})
```