How to update array object value in angular

Trying to update array object value but not working. I am trying to update item value from an array But not updating. How to resolve this issue.

  ngOnInit() {
this.arr = [
  {
    lable: 'test1',
    item: 'Row6',
  },
  {
    lable: 'test2',
    item: 'Row9',
  },
  {
    lable: 'test3',
    item: 'Row4',
  },
];
}

 updateVal() {
    this.arr = this.arr[0].item = 'Row9';
    console.log(this.arr);
 }

Demo: https://stackblitz.com/edit/angular-ivy-srsirm?file=src%2Fapp%2Farrcom%2Farrcom.component.ts

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