diff --git a/mypy.ini b/mypy.ini
index ae6ad6e..056621a 100644
--- a/mypy.ini
+++ b/mypy.ini
@@ -1,15 +1,3 @@
 [mypy]
 ignore_missing_imports = True
-strict_optional = True
-warn_redundant_casts = True
-disallow_untyped_calls = False
-check_untyped_defs = True
-
-[mypy-bravado.client.*]
-disallow_untyped_defs = False
-
-[mypy-bravado.docstring_property.*]
-disallow_untyped_defs = False
-
-[mypy-bravado.swagger_model.*]
-disallow_untyped_defs = False
+disallow_untyped_defs = True
diff --git a/src/lariat/lariat.py b/src/lariat/lariat.py
index 0ba3262..d587ae1 100644
--- a/src/lariat/lariat.py
+++ b/src/lariat/lariat.py
@@ -184,7 +184,7 @@ def api_connect(
 def get_devices(
     client: SwaggerClient,
     request_opts: typing.Dict,
-    fields=typing.Optional[typing.List[str]],
+    fields: typing.Optional[typing.Set[typing.Any]],
 ) -> typing.List[typing.Dict[typing.Any, typing.Any]]:
     """Retrieve a list of devices from the DeviceFarmer API.