```
mutation {
  updateProjectV2ItemFieldValue(input: {
    projectId: "PVT_kwDOBNsuRs4BL8K8"
    itemId: "PVTI_lADOBNsuRs4BL8K8zgp58D4"
    fieldId: "PVTSSF_lADOBNsuRs4BL8K8zg7XWfo"
    value: {
      singleSelectOptionId: "61e4505c"
    }
  }) {
    projectV2Item {
      id
    }
  }
}
```