diff --git a/pyproject.toml b/pyproject.toml
index 5ba7c13..68d3119 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -90,6 +90,11 @@ known-first-party = ["humanize"]
 
 [tool.pytest.ini_options]
 addopts = "--color=yes"
+filterwarnings = [
+    "error",
+    # https://github.com/dateutil/dateutil/issues/1314
+    "ignore:datetime.datetime.utcfromtimestamp:DeprecationWarning:dateutil.tz.tz",
+]
 
 [tool.pydocstyle]
 convention = "google"