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Are you sure the pulumi lib is updated in your environment, we added `merge` quite a while a go.

Since v3.35 based on git log, I'd double check that pulumi is actually at 3.54

Will check that again, by removing my Poetry virtual env and create everything from scratch.

Okay, I see the problem. You are right, Pulumi version 3.33.1 is installed in my Poetry virtual env, because I pinned protobof to 3.20 because of the error:

```    TypeError: Descriptors cannot not be created directly.
    If this call came from a _pb2.py file, your generated code is out of date and must be regenerated with protoc &gt;= 3.19.0.
    If you cannot immediately regenerate your protos, some other possible workarounds are:
     1. Downgrade the protobuf package to 3.20.x or lower.
     2. Set PROTOCOL_BUFFERS_PYTHON_IMPLEMENTATION=python (but this will use pure-Python parsing and will be much slower).
    More information: <https://developers.google.com/protocol-buffers/docs/news/2022-05-06#python-updates>

    error: an unhandled error occurred: program exited with non-zero exit code: 1```

Okay solution:
I’ve pinned protobuf to 3.20.3 and this works.

Thanks!