diff --git a/pyproject.toml b/pyproject.toml
index 23ba25aa..d22337f6 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -92,15 +92,18 @@ sqlalchemy-stubs = "^0.4"
 spiffworkflow-backend = "spiffworkflow_backend.__main__:main"
 
 [tool.pytest.ini_options]
-# ignore three deprecation warnings from three different packages
+# ignore deprecation warnings from various packages that we don't control
 filterwarnings = [
     # note the use of single quote below to denote "raw" strings in TOML
     # kombu/utils/compat.py:82
     'ignore:SelectableGroups dict interface is deprecated. Use select.',
+    # flask_marshmallow/__init__.py:34
     # marshmallow_sqlalchemy/convert.py:17
     'ignore:distutils Version classes are deprecated. Use packaging.version instead.',
     # connexion/spec.py:50
-    'ignore:Passing a schema to Validator.iter_errors is deprecated and will be removed in a future release'
+    'ignore:Passing a schema to Validator.iter_errors is deprecated and will be removed in a future release',
+    # connexion/decorators/validation.py:16
+    'ignore:Accessing jsonschema.draft4_format_checker is deprecated and will be removed in a future release.'
 ]
 
 [tool.coverage.paths]