diff --git a/pyproject.toml b/pyproject.toml
index 83b90a2e6..1f3b9bf53 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -29,5 +29,7 @@ timeout = 300
 # timeout_method = "thread"
 filterwarnings = [
     "error",
+    # Pending release of https://github.com/jupyterlab/jupyterlab_server/pull/259
+    "ignore:metadata:DeprecationWarning",
     "ignore:There is no current event loop:DeprecationWarning",
 ]