diff --git a/spock/backend/builder.py b/spock/backend/builder.py
index 949b1ac7..e3ec2d1b 100644
--- a/spock/backend/builder.py
+++ b/spock/backend/builder.py
@@ -727,7 +727,7 @@ def _make_group_override_parser(parser, class_obj, class_name):
                     )
             # If it's a reference to a class it needs to be an arg of a simple string as class matching will take care
             # of it later on
-            elif val_type.__module__ == 'spock.backend.config':
+            elif val_type.__module__ == "spock.backend.config":
                 arg_name = f"--{str(attr_name)}.{val.name}"
                 val_type = str
                 group_parser = make_argument(arg_name, val_type, group_parser)
diff --git a/spock/backend/payload.py b/spock/backend/payload.py
index 7423816e..96bf0ba2 100644
--- a/spock/backend/payload.py
+++ b/spock/backend/payload.py
@@ -395,7 +395,11 @@ def _handle_payload_override(payload, key, value):
         key_split = key.split(".")
         curr_ref = payload
         # Handle non existing parts of the payload for specific cases
-        root_classes = [idx for idx, val in enumerate(key_split) if hasattr(sys.modules["spock"].backend.config, val)]
+        root_classes = [
+            idx
+            for idx, val in enumerate(key_split)
+            if hasattr(sys.modules["spock"].backend.config, val)
+        ]
         # Verify any classes have roots in the payload dict
         for idx in root_classes:
             # Update all root classes if not present
@@ -405,13 +409,24 @@ def _handle_payload_override(payload, key, value):
             # Make sure it's there by setting it -- since this is an override setting is fine as these should be the
             # final say in the param values so don't worry about clashing
             if idx != 0:
-                payload[key_split[0]][key_split[idx-1]] = key_split[idx]
+                payload[key_split[0]][key_split[idx - 1]] = key_split[idx]
                 # Check also for repeated classes -- value will be a list when the type is not
-                var = getattr(getattr(sys.modules["spock"].backend.config, key_split[idx]).__attrs_attrs__, key_split[-1])
+                var = getattr(
+                    getattr(
+                        sys.modules["spock"].backend.config, key_split[idx]
+                    ).__attrs_attrs__,
+                    key_split[-1],
+                )
                 if isinstance(value, list) and var.type != list:
                     # If the dict is blank we need to handle the creation of the list of dicts
                     if len(payload[key_split[idx]]) == 0:
-                        payload.update({key_split[idx]: [{key_split[-1]: None} for _ in range(len(value))]})
+                        payload.update(
+                            {
+                                key_split[idx]: [
+                                    {key_split[-1]: None} for _ in range(len(value))
+                                ]
+                            }
+                        )
                     # If it's already partially filled we need to update not overwrite
                     else:
                         for val in payload[key_split[idx]]:
diff --git a/spock/builder.py b/spock/builder.py
index 20a88819..5ca36245 100644
--- a/spock/builder.py
+++ b/spock/builder.py
@@ -401,7 +401,11 @@ def _get_payload(self, payload_obj, input_classes, ignore_args: typing.List):
                 if len(self._args.config) > 0:
                     for configs in self._args.config:
                         payload_update = payload_obj.payload(
-                            input_classes, ignore_args, configs, self._args, dependencies
+                            input_classes,
+                            ignore_args,
+                            configs,
+                            self._args,
+                            dependencies,
                         )
                         check_payload_overwrite(payload, payload_update, configs)
                         deep_payload_update(payload, payload_update)