From dask image, https://github.com/TGSAI/mdio-docker/blob/e0fc3701716bda18abbc10266f842aeb9fb5b1c6/dask/Dockerfile: s3fs=2025.7.0 From https://github.com/TGSAI/mdio-python/blob/v0.9.3/pyproject.toml: cloud = [ "s3fs == 2024.12.0", ... ] They need to be in sync for distributed.