diff --git a/tox.ini b/tox.ini
index 9a476a1..43b8ba1 100644
--- a/tox.ini
+++ b/tox.ini
@@ -30,7 +30,10 @@ commands =
 
 [pytest]
 addopts = --cov=dandischema --tb=short --durations=10
-filterwarnings = error
+filterwarnings =
+    error
+    # <https://github.com/dateutil/dateutil/issues/1284>
+    ignore:.*utcfromtimestamp.* is deprecated:DeprecationWarning:dateutil
 
 [coverage:run]
 parallel = True