AWS Lambda end of support for Python 3.7

Abinash Kumar
2 min readSep 25


Starting November 27, 2023, Lambda will no longer apply security patches and other updates to the Python 3.7 runtime used by Lambda functions, and functions using Python 3.7 will no longer be eligible for technical support. In addition, you will no longer be able to create new Lambda functions using the Python 3.7 runtime. Starting January 25, 2024, you will no longer be able to update existing functions using the Python 3.7 runtime.

As Python evolves, keeping your Lambda functions up-to-date is crucial to take advantage of new features and improvements. Here’s a step-by-step guide on upgrading your AWS Lambda from Python 3.7 to Python 3.11:

1. Assess Compatibility: Before diving in, assess your existing codebase for any Python 3.7-specific dependencies or syntax. Ensure that your code is compatible with Python 3.11.

2. AWS Console: Log in to your AWS Management Console and navigate to the Lambda service.

3. Select Your Function: Choose the Lambda function that you want to upgrade.

4. Function Configuration: Scroll down to the “Runtime settings” section. Click “Edit” and select “Python 3.11” from the dropdown menu.

5. Update Dependencies: Review and update your function’s dependencies, including any libraries or packages that might need to be upgraded to versions compatible with Python 3.11.

6. Test Locally: Test your Lambda function locally with Python 3.11 to identify any issues before deploying it to AWS.

7. Deployment Package: Create a deployment package that includes your updated code and dependencies. Ensure you include all necessary files and dependencies.

8. Upload and Deploy: In the Lambda function configuration, upload the deployment package. AWS Lambda will automatically detect the runtime as Python 3.11.

9. Function Testing: Test your Lambda function on AWS to make sure everything is working as expected.

10. Monitoring: Set up proper monitoring and logging to keep an eye on the performance of your upgraded Lambda function.

11. Version Control: Consider versioning your Lambda function. This allows you to roll back to the previous version if any issues arise.

12. Cleanup: Once you’ve confirmed that your upgraded function is working correctly, clean up any old versions to avoid unnecessary charges.

Remember that thorough testing is key throughout this process. It’s essential to ensure your Lambda function behaves as expected with the new Python version.

By upgrading to Python 3.11, you’ll benefit from performance improvements, new language features, and security updates, keeping your serverless applications up-to-date and efficient.

Have you upgraded your Lambda functions recently? Share your experiences and tips in the comments. Let’s help each other stay up-to-date in the ever-evolving world of AWS Lambda and Python!