Change lambda from supported runtime to docker image


I have a lambda which was created and deployed with CloudFormation. The lambda, as of now, uses the supported .NET Core 3.1 runtime but I want to use the “unsupported” .Net Core 5 so I have created a Docker image which the lambda can run.

The problem I have is that CloudFormation can’t seem to change the lambda from running a supported runtime to running a Docker image. I get Please don't provide ImageUri when updating a function with packageType Zip. when updating the CloudFormation stack with the updated template.

This is how my CloudFormation template looks like:

Any ideas on how to solve this?


Configuring functions defined as container images

You cannot convert an existing .zip file archive function to use a container image. You must create a new function.

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