# dataset.updateItem()

**Added in:** `@mastra/core@1.4.0`

Updates an existing item in the dataset. Only the provided fields are updated. Updating an item creates a new version.

## Usage example

```typescript
import { Mastra } from "@mastra/core";

const mastra = new Mastra({ /* storage config */ });

const dataset = await mastra.datasets.get({ id: "dataset-id" });

const updated = await dataset.updateItem({
  itemId: "item-id",
  input: { question: "What is TypeScript?" },
  groundTruth: { answer: "A typed superset of JavaScript" },
  metadata: { reviewed: true },
});
```

## Parameters

**itemId:** (`string`): ID of the item to update.

**input?:** (`unknown`): Updated input data.

**groundTruth?:** (`unknown`): Updated ground truth.

**metadata?:** (`Record<string, unknown>`): Updated metadata.

## Returns

**result:** (`Promise<DatasetItem>`): The updated dataset item. See dataset.addItem() for the item shape.