diff --git a/pyproject.toml b/pyproject.toml
index 8a0ea4f4..a24c799e 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -133,6 +133,8 @@ filterwarnings= [
   # from python-dateutil
   "ignore:datetime.datetime.utcfromtimestamp:DeprecationWarning",
   "ignore:datetime.datetime.utcnow:DeprecationWarning",
+  # from ipykernel 6 (fixed in 7)
+  "ignore:ipykernel.jsonutil:DeprecationWarning",
 ]
 
 [tool.coverage.report]