[Home](./index.md) > [@firebase/auth](./auth.md) > [Auth](./auth.auth.md) > [updateCurrentUser](./auth.auth.updatecurrentuser.md) ## Auth.updateCurrentUser() method Asynchronously sets the provided user as [Auth.currentUser](./auth.auth.currentuser.md) on the [Auth](./auth.auth.md) instance. Signature: ```typescript updateCurrentUser(user: User | null): Promise; ``` ## Parameters | Parameter | Type | Description | | --- | --- | --- | | user | [User](./auth.user.md) \| null | The new [User](./auth.user.md). | Returns: Promise<void> ## Remarks A new instance copy of the user provided will be made and set as currentUser. This will trigger [Auth.onAuthStateChanged()](./auth.auth.onauthstatechanged.md) and [Auth.onIdTokenChanged()](./auth.auth.onidtokenchanged.md) listeners like other sign in methods. The operation fails with an error if the user to be updated belongs to a different Firebase project.