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dagster

Hey guys. Got this error during `pip install dagster` to my current project
```
ERROR: dagster 0.5.5 has requirement pyyaml==4.2b1, but you'll have pyyaml 5.1.1 which is incompatible.
```

Hey Oleg we will take a look at this! We had some problems with pyyaml and docker-compose and made the a dependency constraint, but this might have been overkill. I suspect you can workaround this by uninstalling pyyaml, then running pip install dagster, and then reinstalling the pyyaml version that you expect.

Actually, seems dagster was installed, because I can do `import dagster` in repl. Will let you know if something will be broken

yeah pip says “ERROR” where “WARNING” is really more accurate

note that the root cause of this is that docker-compose enforces this constraint:

<https://github.com/docker/compose/blob/master/setup.py>

either way added <https://github.com/dagster-io/dagster/issues/1657> to track. thank you!