diff --git a/pyproject.toml b/pyproject.toml
index 3619c038..4816f1ad 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -153,6 +153,8 @@ force-sort-within-sections = true
 [tool.pytest.ini_options]
 filterwarnings = [
     "error",
+    # From jupyter_client
+    "ignore:There is no current event loop:DeprecationWarning",
 ]
 
 markers = [