Sure, I can help you update the AdSense code in your Blogger theme. Here are the steps: 

1. Go to your Blogger dashboard and click on the "Theme" option. 

2. Find the "Edit HTML" button and click on it. 

3. Look for the code related to your AdSense ads by searching for terms like "ad" or "AdSense" in the code. 

4. Replace the old AdSense code with the new one that you have. 

5. Click on "Save" to save the changes made to the HTML. 

6. Make sure to preview your blog to ensure that the ads are displaying correctly. 

7. After you have confirmed that the ads are displaying correctly, click on "Save Arrangement" to update your blog with the new AdSense code. 

Hope this helps! Let me know if you have any other questions.