> ## Documentation Index
> Fetch the complete documentation index at: https://base-a060aa97-docs-add-b20-spec.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

# IB20.updatePolicy

> Generated B20 reference for updatePolicy(bytes32,uint64).

[Related concept](/base-chain/specs/upgrades/beryl/b20/specification/concepts/policies-and-scopes)

## Signature

```solidity theme={null}
function updatePolicy(bytes32 policyScope, uint64 newPolicyId) external;
```

| Field               | Value                          |
| ------------------- | ------------------------------ |
| Selector            | `0xadf9c4ea`                   |
| Canonical signature | `updatePolicy(bytes32,uint64)` |

## Description

Updates the policy ID assigned to `policyScope`. Takes effect immediately for the next
operation that consults this slot. Emits `PolicyUpdated`.
Dev: Reverts with `AccessControlUnauthorizedAccount` when the caller does not hold `DEFAULT_ADMIN_ROLE`.
Dev: Reverts with `UnsupportedPolicyType` when `policyScope` is not recognized by this token.
Dev: Reverts with `PolicyNotFound` when `newPolicyId` is not a built-in sentinel and does not exist in the registry.
Param: policyScope Policy slot scope.
Param: newPolicyId Policy ID to assign to the slot.

## Access control

`DEFAULT_ADMIN_ROLE` gates this call. Factory initCalls bypass the role gate during creation.

## Policy interaction

Reads or writes a token policy-scope pointer into the PolicyRegistry.

## Example

```solidity theme={null}
IB20(token).updatePolicy(B20Constants.MINT_RECEIVER_POLICY, policyId);
```

## Related

* [IB20 reference](/base-chain/specs/upgrades/beryl/b20/specification/reference/interfaces/IB20)
* [Constants & addresses](/base-chain/specs/upgrades/beryl/b20/specification/reference/constants-and-addresses)