[petercooper]

I don't know if it's relevant but there was an article the other day about how Google is phasing out username:password logins for most Google related services and APIs, so if you have a script running quietly for years doing this task, it might be worth double checking if it will continue to be fine. (It might be, if this u/p is unique to the domain as the docs suggest - but I thought I'd mention it just in case!)

[imaginator]

This is with an application specific username/password pair that GoogleDNS gives you. And will only update that specific record.

[sa3dany]

Would enabling 2-factor auth and using an app-specific passowrd in this case still work? worth a try I guess: https://support.google.com/accounts/answer/185833