diff --git a/modules/api/docs.py b/modules/api/docs.py
index 1eac8226e..2d5ff6e4a 100644
--- a/modules/api/docs.py
+++ b/modules/api/docs.py
@@ -10,11 +10,11 @@ def get_swagger_ui_html(*,
                         title: str,
                         swagger_js_url: str = "https://cdn.jsdelivr.net/npm/swagger-ui-dist@5/swagger-ui-bundle.js",
                         swagger_css_url: str = "https://cdn.jsdelivr.net/npm/swagger-ui-dist@5/swagger-ui.css",
-                        swagger_extra_css_url: str = None,
+                        swagger_extra_css_url: str | None = None,
                         swagger_favicon_url: str = "https://fastapi.tiangolo.com/img/favicon.png",
-                        oauth2_redirect_url: str = None,
-                        init_oauth: dict = None,
-                        swagger_ui_parameters: dict = None,
+                        oauth2_redirect_url: str | None = None,
+                        init_oauth: dict | None = None,
+                        swagger_ui_parameters: dict | None = None,
                        ) -> HTMLResponse:
     current_swagger_ui_parameters = swagger_ui_default_parameters.copy()
     if swagger_ui_parameters:
diff --git a/modules/api/endpoints.py b/modules/api/endpoints.py
index 775fa1bc9..f950db601 100644
--- a/modules/api/endpoints.py
+++ b/modules/api/endpoints.py
@@ -242,7 +242,7 @@ def get_checkpoint():
             checkpoint['hash'] = shared.sd_model.sd_checkpoint_info.shorthash
     return checkpoint
 
-def set_checkpoint(sd_model_checkpoint: str, dtype:str=None, force:bool=False):
+def set_checkpoint(sd_model_checkpoint: str, dtype: str | None = None, force: bool = False):
     """Load a checkpoint by name. Optionally set dtype and force a clean reload."""
     from modules import sd_models, devices
     if force:
diff --git a/modules/api/models.py b/modules/api/models.py
index f51bd3ad9..f32152027 100644
--- a/modules/api/models.py
+++ b/modules/api/models.py
@@ -57,10 +57,10 @@ def underscore(name: str) -> str: # Convert CamelCase or PascalCase string to un
 class PydanticModelGenerator:
     def __init__(
         self,
-        model_name: str = None,
-        class_instance = None,
-        additional_fields = None,
-        exclude_fields: list = None,
+        model_name: str,
+        class_instance,
+        additional_fields: list,
+        exclude_fields: list | None = None,
     ):
         if exclude_fields is None:
             exclude_fields = []
@@ -100,7 +100,7 @@ class PydanticModelGenerator:
             self._model_def = [x for x in self._model_def if x.field != fld]
 
     def generate_model(self):
-        model_fields = { d.field: (d.field_type, Field(default=d.field_value, alias=d.field_alias, exclude=d.field_exclude)) for d in self._model_def }
+        model_fields: dict[str, Any] = { d.field: (d.field_type, Field(default=d.field_value, alias=d.field_alias, exclude=d.field_exclude)) for d in self._model_def }
         if PYDANTIC_V2:
             config = ConfigDict(arbitrary_types_allowed=True, from_attributes=True, populate_by_name=True)
         else:
@@ -507,7 +507,7 @@ class ItemLoadedModel(BaseModel):
 
 # helper function
 
-def create_model_from_signature(func: Callable, model_name: str, base_model: type[BaseModel] = BaseModel, additional_fields: list = None, exclude_fields: list[str] = None) -> type[BaseModel]:
+def create_model_from_signature(func: Callable, model_name: str, base_model: type[BaseModel] = BaseModel, additional_fields: list | None = None, exclude_fields: list[str] | None = None) -> type[BaseModel]:
     from PIL import Image
 
     if exclude_fields is None: