diff --git a/pyproject.toml b/pyproject.toml
index d9e0af76..350f77f8 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -26,6 +26,9 @@ dependencies = [
     "pyzmq>=23.0",
     "tornado>=6.2",
     "traitlets>=5.3",
+    # from python-dateutil
+    "ignore:datetime.datetime.utcfromtimestamp:DeprecationWarning",
+    "ignore:datetime.datetime.utcnow:DeprecationWarning",
 ]
 
 [[project.authors]]