Help with enabling new lambda runtime in older 1.2.0 version

[kiran-g]

I have an old project that uses CDK v1.2.0. Among other things this project creates a lambda function for custom cf resource. I do not have the time to upgrade the CDK version to the latest. Also as the application is for purely internal demo purpose, I dont think there is any security issue in using the old version of CDK.

My current issue is that I am not able to deploy the project as the nodejs lambda runtime version is no longer supported by AWS. So I would like to know if there is any quick hacky way of enabling the new lambda runtime in the old CDK version. I tried to add the latest runtime version macros in the old version. But I was getting errors. If someone can guide me to do it the correct way, I would really appreciate it.