Update Lambda Runtime (pyhton 3.9 to 3.11)

Question

I have many lambdas were created with CDK and I want to update the runtime. 
I've done these changes: 
* I Updated python 3.11 in Cloud9 (also in venv)
* I Changed the CDK code where modify the runtime like this:

```
runtime=lambda_.Runtime.PYTHON_3_9  -> runtime=lambda_.Runtime.PYTHON_3_11
```

But I get this error when I try to deploy:
***RuntimeError: This lambda function uses a runtime that is incompatible with this layer (python3.11 is not in [python3.9])***

This is part of the content of my requirements.txt file:

```
aws-cdk-lib==2.118.0
aws-cdk.aws-lambda-python-alpha==2.118.0a0
aws_ddk_core==1.4.0
boto3==1.34.12
```

Why Do I get that error? What have to do if I want to update the runtime?

Accepted Answer

You have layers attached to the lambda function. On the layers you define the version of python that they are compatible with.

They will need to be updated too.

Update Lambda Runtime (pyhton 3.9 to 3.11)

Relevant content