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There are definitely breaking changes. These links should help:

<https://www.pulumi.com/docs/get-started/install/migrating-3.0/>

<https://github.com/pulumi/pulumi-gcp/blob/master/CHANGELOG_OLD.md#600-2021-11-16>

<https://github.com/pulumi/pulumi-gcp/blob/master/CHANGELOG_OLD.md#500-2021-04-19>