diff --git a/python/langsmith/_testing.py b/python/langsmith/_testing.py
index ea52c79f3..67adbab31 100644
--- a/python/langsmith/_testing.py
+++ b/python/langsmith/_testing.py
@@ -320,7 +320,7 @@ def _start_experiment(
 # Track the number of times a parameter has been used in a test
 # This is to ensure that we can uniquely identify each test case
 # defined using pytest.mark.parametrize
-_param_dict = defaultdict(lambda: defaultdict(int))
+_param_dict: dict = defaultdict(lambda: defaultdict(int))
 
 
 def _get_id(func: Callable, inputs: dict, suite_id: uuid.UUID) -> Tuple[uuid.UUID, str]:
diff --git a/python/tests/unit_tests/test_testing.py b/python/tests/unit_tests/test_testing.py
index 3a5f05e97..893074e4d 100644
--- a/python/tests/unit_tests/test_testing.py
+++ b/python/tests/unit_tests/test_testing.py
@@ -16,7 +16,7 @@ def __init__(self, a, b):
 
 def test__get_id():
     class Foo:
-        bar: str = "baz"
+        bar: str = "baz"  # type: ignore
 
         def __init__(self, a: int, b: int):
             self.a = a