# Serverless index connection errors

## Problem

To connect to a serverless index, you must use an updated Pinecone client. Trying to connect to a serverless index with an outdated client will raise errors similar to one of the following:

```console console theme={null}
Failed to resolve 'controller.us-west-2.pinecone.io'

controller.us-west-2-aws.pinecone.io not found

Request failed to reach Pinecone while calling https://controller.us-west-2.pinecone.io/actions/whoami
```

## Solution

Upgrade to the latest [Python](https://github.com/pinecone-io/pinecone-python-client) or [Node.js](https://sdk.pinecone.io/typescript/) client and try again:

:::code-group
```python Python theme={null}
pip install "pinecone[grpc]" --upgrade
```

```js JavaScript theme={null}
npm install @pinecone-database/pinecone@latest
```
:::

## Related pages

- [Account management](./account-management-index.md)
- [Admin](./admin-2-index.md)
- [Admin](./admin-index.md)
- [APIs](./apis-index.md)
- [Architecture](./architecture-index.md)
- [Assistants](./assistants-index.md)
- [Bring Your Own Cloud](./bring-your-own-cloud-index.md)
- [Build an assistant](./build-an-assistant-index.md)
- [Build an integration](./build-an-integration-index.md)
- [Changelog](./changelog-index.md)

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