Yes—this warning comes from Python deprecating naive UTC helpers like

datetime.datetime.utcnow()

in favor of timezone-aware datetimes. What to do instead: - Python 3.11+:

from datetime import datetime, UTC

  now_utc = datetime.now(UTC)

- Python 3.10 and earlier:

from datetime import datetime, timezone

  now_utc = datetime.now(timezone.utc)

Replacements for other deprecated UTC helpers: -

datetime.utcfromtimestamp(ts)

→

datetime.fromtimestamp(ts, UTC)

(or

timezone.utc

on older Pythons)

from datetime import datetime, UTC

  dt = datetime.fromtimestamp(ts, UTC)

- If you truly have a naive datetime that you know is already UTC and need to mark it as such (avoid unless you’re sure):

from datetime import UTC

  aware = naive_dt.replace(tzinfo=UTC)

If the warning is coming from a dependency (e.g., Prefect or another library): - Upgrade the package to the latest version (many libraries have already addressed this). - If you must suppress temporarily, do it narrowly so you don’t hide other important deprecations:

import warnings

  warnings.filterwarnings(
      "ignore",
      category=DeprecationWarning,
      message=r".*utcnow\(\) is deprecated.*",
      module=r"^the_dependency_name(\.|$)",
  )

Helpful references: - Python docs: datetime.utcnow (deprecated) - Python docs: aware vs. naive datetimes If this warning is popping up while using Prefect, can you share the stack trace or the exact line that triggers it? We can point to the exact fix or confirm if it’s from a dependency that needs updating.