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Actually.. even if I just change the tag value (from `f'pulumi-sn-{zone}'` to `test`), `pulumi up` fails with that error…

seems to happen on _any_ changes to a Vpc, actually

i destroyed my stack, created a new one. deleted ALL my resources except the Vpc, and it’s still failing.
if I comment out the Vpc, everything works just fine

Hi <@U019P3V40G4>, I’ve reproduced the problem. It looks like it’s due to some extra type checks we added in the `pulumi` Python SDK in v2.9.0, which fails when certain values come back from the engine that aren’t expected. I’m going to open an issue and work on a fix. In the meantime, you can workaround by downgrading you Python package dependencies to `pulumi` v2.8.2 and `pulumi_aws` v3.1.0.

Hi <@UB9EMC6TY>! Thanks for taking a look!

I also cross-posted this to <#C84L4E3N1|>, and found another person who ran into the same issue

Threads:

<https://pulumi-community.slack.com/archives/C84L4E3N1/p1598590542226600?thread_ts=1598590542.226600&amp;cid=C84L4E3N1|https://pulumi-community.slack.com/archives/C84L4E3N1/p1598590542226600?thread_ts=1598590542.226600&amp;cid=C84L4E3N1>

<https://pulumi-community.slack.com/archives/C84L4E3N1/p1598631037246000?thread_ts=1598631037.246000&amp;cid=C84L4E3N1|https://pulumi-community.slack.com/archives/C84L4E3N1/p1598631037246000?thread_ts=1598631037.246000&amp;cid=C84L4E3N1>

Thanks again!

<https://github.com/pulumi/pulumi/issues/5250>

The fix has been released in version `2.9.2` of the `pulumi` package, which will work with `pulumi-aws` version `3.2.1`.