diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
index 767ef8d9e..05c33a608 100644
--- a/.pre-commit-config.yaml
+++ b/.pre-commit-config.yaml
@@ -14,7 +14,7 @@ repos:
     -   id: end-of-file-fixer
     -   id: trailing-whitespace
 -   repo: https://github.com/astral-sh/ruff-pre-commit
-    rev: v0.7.4
+    rev: v0.9.4
     hooks:
     -   id: ruff
         args:
diff --git a/fastapi/dependencies/utils.py b/fastapi/dependencies/utils.py
index e2866b488..d205d17fa 100644
--- a/fastapi/dependencies/utils.py
+++ b/fastapi/dependencies/utils.py
@@ -133,9 +133,9 @@ def get_param_sub_dependant(
 
 
 def get_parameterless_sub_dependant(*, depends: params.Depends, path: str) -> Dependant:
-    assert callable(
-        depends.dependency
-    ), "A parameter-less dependency must have a callable dependency"
+    assert callable(depends.dependency), (
+        "A parameter-less dependency must have a callable dependency"
+    )
     return get_sub_dependant(depends=depends, dependency=depends.dependency, path=path)
 
 
@@ -302,9 +302,9 @@ def get_dependant(
             type_annotation=param_details.type_annotation,
             dependant=dependant,
         ):
-            assert (
-                param_details.field is None
-            ), f"Cannot specify multiple FastAPI annotations for {param_name!r}"
+            assert param_details.field is None, (
+                f"Cannot specify multiple FastAPI annotations for {param_name!r}"
+            )
             continue
         assert param_details.field is not None
         if isinstance(param_details.field.field_info, params.Body):
@@ -439,9 +439,9 @@ def analyze_param(
         ),
     ):
         assert depends is None, f"Cannot specify `Depends` for type {type_annotation!r}"
-        assert (
-            field_info is None
-        ), f"Cannot specify FastAPI annotation for type {type_annotation!r}"
+        assert field_info is None, (
+            f"Cannot specify FastAPI annotation for type {type_annotation!r}"
+        )
     # Handle default assignations, neither field_info nor depends was not found in Annotated nor default value
     elif field_info is None and depends is None:
         default_value = value if value is not inspect.Signature.empty else RequiredParam
@@ -494,9 +494,9 @@ def analyze_param(
             field_info=field_info,
         )
         if is_path_param:
-            assert is_scalar_field(
-                field=field
-            ), "Path params must be of one of the supported types"
+            assert is_scalar_field(field=field), (
+                "Path params must be of one of the supported types"
+            )
         elif isinstance(field_info, params.Query):
             assert (
                 is_scalar_field(field)
@@ -521,9 +521,9 @@ def add_param_to_fields(*, field: ModelField, dependant: Dependant) -> None:
     elif field_info_in == params.ParamTypes.header:
         dependant.header_params.append(field)
     else:
-        assert (
-            field_info_in == params.ParamTypes.cookie
-        ), f"non-body parameters must be in path, query, header or cookie: {field.name}"
+        assert field_info_in == params.ParamTypes.cookie, (
+            f"non-body parameters must be in path, query, header or cookie: {field.name}"
+        )
         dependant.cookie_params.append(field)
 
 
@@ -782,9 +782,9 @@ def request_params_to_args(
 
     if single_not_embedded_field:
         field_info = first_field.field_info
-        assert isinstance(
-            field_info, params.Param
-        ), "Params must be subclasses of Param"
+        assert isinstance(field_info, params.Param), (
+            "Params must be subclasses of Param"
+        )
         loc: Tuple[str, ...] = (field_info.in_.value,)
         v_, errors_ = _validate_value_with_model_field(
             field=first_field, value=params_to_process, values=values, loc=loc
@@ -794,9 +794,9 @@ def request_params_to_args(
     for field in fields:
         value = _get_multidict_value(field, received_params)
         field_info = field.field_info
-        assert isinstance(
-            field_info, params.Param
-        ), "Params must be subclasses of Param"
+        assert isinstance(field_info, params.Param), (
+            "Params must be subclasses of Param"
+        )
         loc = (field_info.in_.value, field.alias)
         v_, errors_ = _validate_value_with_model_field(
             field=field, value=value, values=values, loc=loc
diff --git a/fastapi/openapi/utils.py b/fastapi/openapi/utils.py
index 947eca948..bd8f3c106 100644
--- a/fastapi/openapi/utils.py
+++ b/fastapi/openapi/utils.py
@@ -364,9 +364,9 @@ def get_openapi_path(
                     openapi_response = operation_responses.setdefault(
                         status_code_key, {}
                     )
-                    assert isinstance(
-                        process_response, dict
-                    ), "An additional response must be a dict"
+                    assert isinstance(process_response, dict), (
+                        "An additional response must be a dict"
+                    )
                     field = route.response_fields.get(additional_status_code)
                     additional_field_schema: Optional[Dict[str, Any]] = None
                     if field:
@@ -434,9 +434,9 @@ def get_fields_from_routes(
             route, routing.APIRoute
         ):
             if route.body_field:
-                assert isinstance(
-                    route.body_field, ModelField
-                ), "A request body must be a Pydantic Field"
+                assert isinstance(route.body_field, ModelField), (
+                    "A request body must be a Pydantic Field"
+                )
                 body_fields_from_routes.append(route.body_field)
             if route.response_field:
                 responses_from_routes.append(route.response_field)
diff --git a/fastapi/routing.py b/fastapi/routing.py
index 8ea4bb219..457481e32 100644
--- a/fastapi/routing.py
+++ b/fastapi/routing.py
@@ -504,9 +504,9 @@ class APIRoute(routing.Route):
             status_code = int(status_code)
         self.status_code = status_code
         if self.response_model:
-            assert is_body_allowed_for_status_code(
-                status_code
-            ), f"Status code {status_code} must not have a response body"
+            assert is_body_allowed_for_status_code(status_code), (
+                f"Status code {status_code} must not have a response body"
+            )
             response_name = "Response_" + self.unique_id
             self.response_field = create_model_field(
                 name=response_name,
@@ -537,9 +537,9 @@ class APIRoute(routing.Route):
             assert isinstance(response, dict), "An additional response must be a dict"
             model = response.get("model")
             if model:
-                assert is_body_allowed_for_status_code(
-                    additional_status_code
-                ), f"Status code {additional_status_code} must not have a response body"
+                assert is_body_allowed_for_status_code(additional_status_code), (
+                    f"Status code {additional_status_code} must not have a response body"
+                )
                 response_name = f"Response_{additional_status_code}_{self.unique_id}"
                 response_field = create_model_field(
                     name=response_name, type_=model, mode="serialization"
@@ -844,9 +844,9 @@ class APIRouter(routing.Router):
         )
         if prefix:
             assert prefix.startswith("/"), "A path prefix must start with '/'"
-            assert not prefix.endswith(
-                "/"
-            ), "A path prefix must not end with '/', as the routes will start with '/'"
+            assert not prefix.endswith("/"), (
+                "A path prefix must not end with '/', as the routes will start with '/'"
+            )
         self.prefix = prefix
         self.tags: List[Union[str, Enum]] = tags or []
         self.dependencies = list(dependencies or [])
@@ -1256,9 +1256,9 @@ class APIRouter(routing.Router):
         """
         if prefix:
             assert prefix.startswith("/"), "A path prefix must start with '/'"
-            assert not prefix.endswith(
-                "/"
-            ), "A path prefix must not end with '/', as the routes will start with '/'"
+            assert not prefix.endswith("/"), (
+                "A path prefix must not end with '/', as the routes will start with '/'"
+            )
         else:
             for r in router.routes:
                 path = getattr(r, "path")  # noqa: B009
diff --git a/requirements-docs-tests.txt b/requirements-docs-tests.txt
index 331d2a5b3..e7718e61d 100644
--- a/requirements-docs-tests.txt
+++ b/requirements-docs-tests.txt
@@ -1,4 +1,4 @@
 # For mkdocstrings and tests
 httpx >=0.23.0,<0.28.0
 # For linting and generating docs versions
-ruff ==0.6.4
+ruff ==0.9.4
diff --git a/scripts/translate.py b/scripts/translate.py
index ce11b3877..9a2136d1b 100644
--- a/scripts/translate.py
+++ b/scripts/translate.py
@@ -38,9 +38,9 @@ def get_langs() -> dict[str, str]:
 
 def generate_lang_path(*, lang: str, path: Path) -> Path:
     en_docs_path = Path("docs/en/docs")
-    assert str(path).startswith(
-        str(en_docs_path)
-    ), f"Path must be inside {en_docs_path}"
+    assert str(path).startswith(str(en_docs_path)), (
+        f"Path must be inside {en_docs_path}"
+    )
     lang_docs_path = Path(f"docs/{lang}/docs")
     out_path = Path(str(path).replace(str(en_docs_path), str(lang_docs_path)))
     return out_path
@@ -56,9 +56,9 @@ def translate_page(*, lang: str, path: Path) -> None:
     lang_prompt_content = lang_prompt_path.read_text()
 
     en_docs_path = Path("docs/en/docs")
-    assert str(path).startswith(
-        str(en_docs_path)
-    ), f"Path must be inside {en_docs_path}"
+    assert str(path).startswith(str(en_docs_path)), (
+        f"Path must be inside {en_docs_path}"
+    )
     out_path = generate_lang_path(lang=lang, path=path)
     out_path.parent.mkdir(parents=True, exist_ok=True)
     original_content = path.read_text()
diff --git a/tests/test_enforce_once_required_parameter.py b/tests/test_enforce_once_required_parameter.py
index b64f8341b..30329282f 100644
--- a/tests/test_enforce_once_required_parameter.py
+++ b/tests/test_enforce_once_required_parameter.py
@@ -48,7 +48,7 @@ expected_schema = {
                         "type": "array",
                     },
                     "msg": {"title": "Message", "type": "string"},
-                    "type": {"title": "Error " "Type", "type": "string"},
+                    "type": {"title": "Error Type", "type": "string"},
                 },
                 "required": ["loc", "msg", "type"],
                 "title": "ValidationError",
@@ -73,7 +73,7 @@ expected_schema = {
                 "responses": {
                     "200": {
                         "content": {"application/json": {"schema": {}}},
-                        "description": "Successful " "Response",
+                        "description": "Successful Response",
                     },
                     "422": {
                         "content": {
@@ -83,7 +83,7 @@ expected_schema = {
                                 }
                             }
                         },
-                        "description": "Validation " "Error",
+                        "description": "Validation Error",
                     },
                 },
                 "summary": "Foo Handler",
diff --git a/tests/test_generic_parameterless_depends.py b/tests/test_generic_parameterless_depends.py
index fe13ff89b..5aa35320c 100644
--- a/tests/test_generic_parameterless_depends.py
+++ b/tests/test_generic_parameterless_depends.py
@@ -55,7 +55,7 @@ def test_openapi_schema():
                     "responses": {
                         "200": {
                             "content": {"application/json": {"schema": {}}},
-                            "description": "Successful " "Response",
+                            "description": "Successful Response",
                         }
                     },
                     "summary": "A",
@@ -67,7 +67,7 @@ def test_openapi_schema():
                     "responses": {
                         "200": {
                             "content": {"application/json": {"schema": {}}},
-                            "description": "Successful " "Response",
+                            "description": "Successful Response",
                         }
                     },
                     "summary": "B",
diff --git a/tests/test_repeated_dependency_schema.py b/tests/test_repeated_dependency_schema.py
index d7d0dfa05..c21829bd9 100644
--- a/tests/test_repeated_dependency_schema.py
+++ b/tests/test_repeated_dependency_schema.py
@@ -41,7 +41,7 @@ schema = {
                         "type": "array",
                     },
                     "msg": {"title": "Message", "type": "string"},
-                    "type": {"title": "Error " "Type", "type": "string"},
+                    "type": {"title": "Error Type", "type": "string"},
                 },
                 "required": ["loc", "msg", "type"],
                 "title": "ValidationError",
@@ -66,7 +66,7 @@ schema = {
                 "responses": {
                     "200": {
                         "content": {"application/json": {"schema": {}}},
-                        "description": "Successful " "Response",
+                        "description": "Successful Response",
                     },
                     "422": {
                         "content": {
@@ -76,7 +76,7 @@ schema = {
                                 }
                             }
                         },
-                        "description": "Validation " "Error",
+                        "description": "Validation Error",
                     },
                 },
                 "summary": "Get Deps",
diff --git a/tests/test_tutorial/test_configure_swagger_ui/test_tutorial001.py b/tests/test_tutorial/test_configure_swagger_ui/test_tutorial001.py
index 72db54bd2..a04dba219 100644
--- a/tests/test_tutorial/test_configure_swagger_ui/test_tutorial001.py
+++ b/tests/test_tutorial/test_configure_swagger_ui/test_tutorial001.py
@@ -8,31 +8,31 @@ client = TestClient(app)
 def test_swagger_ui():
     response = client.get("/docs")
     assert response.status_code == 200, response.text
-    assert (
-        '"syntaxHighlight": false' in response.text
-    ), "syntaxHighlight should be included and converted to JSON"
-    assert (
-        '"dom_id": "#swagger-ui"' in response.text
-    ), "default configs should be preserved"
+    assert '"syntaxHighlight": false' in response.text, (
+        "syntaxHighlight should be included and converted to JSON"
+    )
+    assert '"dom_id": "#swagger-ui"' in response.text, (
+        "default configs should be preserved"
+    )
     assert "presets: [" in response.text, "default configs should be preserved"
-    assert (
-        "SwaggerUIBundle.presets.apis," in response.text
-    ), "default configs should be preserved"
-    assert (
-        "SwaggerUIBundle.SwaggerUIStandalonePreset" in response.text
-    ), "default configs should be preserved"
-    assert (
-        '"layout": "BaseLayout",' in response.text
-    ), "default configs should be preserved"
-    assert (
-        '"deepLinking": true,' in response.text
-    ), "default configs should be preserved"
-    assert (
-        '"showExtensions": true,' in response.text
-    ), "default configs should be preserved"
-    assert (
-        '"showCommonExtensions": true,' in response.text
-    ), "default configs should be preserved"
+    assert "SwaggerUIBundle.presets.apis," in response.text, (
+        "default configs should be preserved"
+    )
+    assert "SwaggerUIBundle.SwaggerUIStandalonePreset" in response.text, (
+        "default configs should be preserved"
+    )
+    assert '"layout": "BaseLayout",' in response.text, (
+        "default configs should be preserved"
+    )
+    assert '"deepLinking": true,' in response.text, (
+        "default configs should be preserved"
+    )
+    assert '"showExtensions": true,' in response.text, (
+        "default configs should be preserved"
+    )
+    assert '"showCommonExtensions": true,' in response.text, (
+        "default configs should be preserved"
+    )
 
 
 def test_get_users():
diff --git a/tests/test_tutorial/test_configure_swagger_ui/test_tutorial002.py b/tests/test_tutorial/test_configure_swagger_ui/test_tutorial002.py
index d06a385b5..ea56b6f21 100644
--- a/tests/test_tutorial/test_configure_swagger_ui/test_tutorial002.py
+++ b/tests/test_tutorial/test_configure_swagger_ui/test_tutorial002.py
@@ -8,34 +8,34 @@ client = TestClient(app)
 def test_swagger_ui():
     response = client.get("/docs")
     assert response.status_code == 200, response.text
-    assert (
-        '"syntaxHighlight": false' not in response.text
-    ), "not used parameters should not be included"
-    assert (
-        '"syntaxHighlight": {"theme": "obsidian"}' in response.text
-    ), "parameters with middle dots should be included in a JSON compatible way"
-    assert (
-        '"dom_id": "#swagger-ui"' in response.text
-    ), "default configs should be preserved"
+    assert '"syntaxHighlight": false' not in response.text, (
+        "not used parameters should not be included"
+    )
+    assert '"syntaxHighlight": {"theme": "obsidian"}' in response.text, (
+        "parameters with middle dots should be included in a JSON compatible way"
+    )
+    assert '"dom_id": "#swagger-ui"' in response.text, (
+        "default configs should be preserved"
+    )
     assert "presets: [" in response.text, "default configs should be preserved"
-    assert (
-        "SwaggerUIBundle.presets.apis," in response.text
-    ), "default configs should be preserved"
-    assert (
-        "SwaggerUIBundle.SwaggerUIStandalonePreset" in response.text
-    ), "default configs should be preserved"
-    assert (
-        '"layout": "BaseLayout",' in response.text
-    ), "default configs should be preserved"
-    assert (
-        '"deepLinking": true,' in response.text
-    ), "default configs should be preserved"
-    assert (
-        '"showExtensions": true,' in response.text
-    ), "default configs should be preserved"
-    assert (
-        '"showCommonExtensions": true,' in response.text
-    ), "default configs should be preserved"
+    assert "SwaggerUIBundle.presets.apis," in response.text, (
+        "default configs should be preserved"
+    )
+    assert "SwaggerUIBundle.SwaggerUIStandalonePreset" in response.text, (
+        "default configs should be preserved"
+    )
+    assert '"layout": "BaseLayout",' in response.text, (
+        "default configs should be preserved"
+    )
+    assert '"deepLinking": true,' in response.text, (
+        "default configs should be preserved"
+    )
+    assert '"showExtensions": true,' in response.text, (
+        "default configs should be preserved"
+    )
+    assert '"showCommonExtensions": true,' in response.text, (
+        "default configs should be preserved"
+    )
 
 
 def test_get_users():
diff --git a/tests/test_tutorial/test_configure_swagger_ui/test_tutorial003.py b/tests/test_tutorial/test_configure_swagger_ui/test_tutorial003.py
index 187e89ace..926bbb14f 100644
--- a/tests/test_tutorial/test_configure_swagger_ui/test_tutorial003.py
+++ b/tests/test_tutorial/test_configure_swagger_ui/test_tutorial003.py
@@ -8,34 +8,34 @@ client = TestClient(app)
 def test_swagger_ui():
     response = client.get("/docs")
     assert response.status_code == 200, response.text
-    assert (
-        '"deepLinking": false,' in response.text
-    ), "overridden configs should be preserved"
-    assert (
-        '"deepLinking": true' not in response.text
-    ), "overridden configs should not include the old value"
-    assert (
-        '"syntaxHighlight": false' not in response.text
-    ), "not used parameters should not be included"
-    assert (
-        '"dom_id": "#swagger-ui"' in response.text
-    ), "default configs should be preserved"
+    assert '"deepLinking": false,' in response.text, (
+        "overridden configs should be preserved"
+    )
+    assert '"deepLinking": true' not in response.text, (
+        "overridden configs should not include the old value"
+    )
+    assert '"syntaxHighlight": false' not in response.text, (
+        "not used parameters should not be included"
+    )
+    assert '"dom_id": "#swagger-ui"' in response.text, (
+        "default configs should be preserved"
+    )
     assert "presets: [" in response.text, "default configs should be preserved"
-    assert (
-        "SwaggerUIBundle.presets.apis," in response.text
-    ), "default configs should be preserved"
-    assert (
-        "SwaggerUIBundle.SwaggerUIStandalonePreset" in response.text
-    ), "default configs should be preserved"
-    assert (
-        '"layout": "BaseLayout",' in response.text
-    ), "default configs should be preserved"
-    assert (
-        '"showExtensions": true,' in response.text
-    ), "default configs should be preserved"
-    assert (
-        '"showCommonExtensions": true,' in response.text
-    ), "default configs should be preserved"
+    assert "SwaggerUIBundle.presets.apis," in response.text, (
+        "default configs should be preserved"
+    )
+    assert "SwaggerUIBundle.SwaggerUIStandalonePreset" in response.text, (
+        "default configs should be preserved"
+    )
+    assert '"layout": "BaseLayout",' in response.text, (
+        "default configs should be preserved"
+    )
+    assert '"showExtensions": true,' in response.text, (
+        "default configs should be preserved"
+    )
+    assert '"showCommonExtensions": true,' in response.text, (
+        "default configs should be preserved"
+    )
 
 
 def test_get_users():
diff --git a/tests/test_tutorial/test_sql_databases/test_tutorial002.py b/tests/test_tutorial/test_sql_databases/test_tutorial002.py
index 68c1966f5..79e48c1c3 100644
--- a/tests/test_tutorial/test_sql_databases/test_tutorial002.py
+++ b/tests/test_tutorial/test_sql_databases/test_tutorial002.py
@@ -71,9 +71,9 @@ def test_crud_app(client: TestClient):
         assert response.json() == snapshot(
             {"age": 30, "id": IsInt(), "name": "Dead Pond"}
         )
-        assert (
-            response.json()["id"] != 9000
-        ), "The ID should be generated by the database"
+        assert response.json()["id"] != 9000, (
+            "The ID should be generated by the database"
+        )
 
         # Read a hero
         hero_id = response.json()["id"]