To troubleshoot issues with charts not updating with new data in Excel:

1. Check your data source is still connected.
2. Ensure the relevant data is arranged in a table/range.
3. Check the chart data is referencing the correct range.
4. Confirm the chart type is appropriate for the data.
5. Check the chart has been plotted against the correct axis.
6. Manually refresh the chart data.
7. Ensure your Excel version is up-to-date.