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I believe you need to use the `vpcSecurityGroupIds` property. The `securityGroups` property is only meant for EC2 Classic, which I'll admit is confusing. We've previously discussed deprecating it (<https://github.com/pulumi/pulumi-aws/issues/852>) and as someone who it's personally bitten many a time, I would give a hearty :+1: to that FWIW.

Actually, in theory we did add a deprecation message in <https://github.com/pulumi/pulumi-aws/pull/902> ... assuming this is the root problem, I wonder why you didn't see that.

<@U84SY03DF> yep that was it! I came across the `vpcSecurityGroupIds` recommendation warning after I upgraded my pulumi packages