[Home](./index.md) > [@firebase/firestore](./firestore.md) > [/](./firestore_.md) > [Transaction](./firestore_.transaction.md) > [update](./firestore_.transaction.update_1.md) ## Transaction.update() method Signature: ```typescript update(documentRef: DocumentReference, field: string | FieldPath, value: unknown, ...moreFieldsAndValues: unknown[]): this; ``` ## Parameters | Parameter | Type | Description | | --- | --- | --- | | documentRef | [DocumentReference](./firestore_.documentreference.md)<unknown> | | | field | string \| [FieldPath](./firestore_.fieldpath.md) | | | value | unknown | | | moreFieldsAndValues | unknown\[\] | | Returns: this