Follow these steps to update the inserted Excel chart in your OneNote notebook:

1. Open your Excel workbook where the chart was created.
2. Select the chart you want to update.
3. Right click the chart and select Edit Data.
4. Enter new data or edit existing data in the data sheet for your chart.
5. Close the Excel file.
6. Open the OneNote notebook.
7. Click on the chart to select it.
8. Right click the chart and select Update Now.