Problem with deploy after upgrade to 1.2

I have a setup in Travis which deploys to a testing environment and runs functional tests on it. But when I upgraded to Serverless 1.2 and run the task on Travis now, it fails with error “AuthEmailTriggerLambdaFunction - Request must be smaller than 5120 bytes for the UpdateFunctionConfiguration operation.”. And I don’t have a clue what it should mean. Limit of 5 kB? What for, the uploaded zip? My functions have 9 MB and I never had a problem with their deploy. Could there be some invisible upload limit in Travis environment? But it worked with SLS 1.1 so I don’t understand much. ;os