bryanyang0528 commented on issue #4935: [AIRFLOW-4113] Unpin boto3 URL: https://github.com/apache/airflow/pull/4935#issuecomment-475872394 I resolved this issue by updating the version of `botocore` to `1.12.120` and `moto` to `1.3.7`. By the way, after updating `moto` to `1.3.7`, you have to export `AWS_SECRET_ACCESS_KEY` and `AWS_ACCESS_KEY_ID` to whatever to avoid `NoCredentialsError`. Reference: https://github.com/spulec/moto/issues/1924
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