If you are using App Engine on the Google Cloud Platform (GCP) you shouldn’t be too surprised when receiving an email stating the current version you are using is being deprecated. Chances are you haven’t read Google’s deprecation policy, which also applies to App Engine (listed here). which basically states that if Google decides to upgrade their services and deprecate older version, they can. And will. And you will be forced to follow along.

So of course, the email which came on June 27, 2019 should not have come as a surprise to you:

Hello Google App Engine Customer,

We’re writing to let you know that Go versions prior to 1.11 are no longer supported on App Engine, and new deployments using these language versions (1.6, 1.8, and 1.9) will not be available starting October 1, 2019.

This left about 3 months to upgrade.

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