diff --git a/fastapi/_compat.py b/fastapi/_compat.py
index c07e4a3b0..f019c961d 100644
--- a/fastapi/_compat.py
+++ b/fastapi/_compat.py
@@ -197,7 +197,20 @@ if PYDANTIC_V2:
             None if separate_input_output_schemas else "validation"
         )
         # This expects that GenerateJsonSchema was already used to generate the definitions
-        json_schema = field_mapping[(field, override_mode or field.mode)]
+        try:
+            json_schema = field_mapping[(field, override_mode or field.mode)]
+        except KeyError:
+            inputs = [
+                (field, override_mode or field.mode, field._type_adapter.core_schema)
+            ]
+            new_generator = GenerateJsonSchema(
+                ref_template=schema_generator.ref_template
+            )
+            new_field_mapping, definitions = new_generator.generate_definitions(
+                inputs=inputs
+            )
+            field_mapping.update(new_field_mapping)
+            json_schema = field_mapping[(field, override_mode or field.mode)]
         if "$ref" not in json_schema:
             # TODO remove when deprecating Pydantic v1
             # Ref: https://github.com/pydantic/pydantic/blob/d61792cc42c80b13b23e3ffa74bc37ec7c77f7d1/pydantic/schema.py#L207
diff --git a/fastapi/dependencies/utils.py b/fastapi/dependencies/utils.py
index 84dfa4d03..55a9e9d67 100644
--- a/fastapi/dependencies/utils.py
+++ b/fastapi/dependencies/utils.py
@@ -121,6 +121,7 @@ def get_param_sub_dependant(
     depends: params.Depends,
     path: str,
     security_scopes: Optional[List[str]] = None,
+    dependency_overrides: Optional[Dict[Callable[..., Any], Callable[..., Any]]] = None,
 ) -> Dependant:
     assert depends.dependency
     return get_sub_dependant(
@@ -129,6 +130,7 @@ def get_param_sub_dependant(
         path=path,
         name=param_name,
         security_scopes=security_scopes,
+        dependency_overrides=dependency_overrides,
     )
 
 
@@ -146,7 +148,9 @@ def get_sub_dependant(
     path: str,
     name: Optional[str] = None,
     security_scopes: Optional[List[str]] = None,
+    dependency_overrides: Optional[Dict[Callable[..., Any], Callable[..., Any]]] = None,
 ) -> Dependant:
+    dependency = (dependency_overrides or {}).get(dependency, dependency)
     security_requirement = None
     security_scopes = security_scopes or []
     if isinstance(depends, params.Security):
@@ -165,6 +169,7 @@ def get_sub_dependant(
         name=name,
         security_scopes=security_scopes,
         use_cache=depends.use_cache,
+        dependency_overrides=dependency_overrides,
     )
     if security_requirement:
         sub_dependant.security_requirements.append(security_requirement)
@@ -262,6 +267,46 @@ def get_typed_return_annotation(call: Callable[..., Any]) -> Any:
     return get_typed_annotation(annotation, globalns)
 
 
+def get_resolved_dependant(
+    *,
+    dependant: Dependant,
+    dependency_overrides: Optional[Dict[Callable[..., Any], Callable[..., Any]]] = None,
+) -> Dependant:
+    new_call = call = dependant.call
+    if call:
+        new_call = (dependency_overrides or {}).get(call)
+    if new_call:
+        resolved_dependant = get_dependant(
+            path=dependant.path or "",
+            call=new_call,
+            name=dependant.name,
+            security_scopes=dependant.security_scopes,
+            use_cache=False,
+            dependency_overrides=dependency_overrides,
+        )
+    else:
+        resolved_dependant = Dependant(
+            call=dependant.call,
+            name=dependant.name,
+            path=dependant.path,
+            security_scopes=dependant.security_scopes,
+            use_cache=False,
+            path_params=dependant.path_params.copy(),
+            query_params=dependant.query_params.copy(),
+            header_params=dependant.header_params.copy(),
+            cookie_params=dependant.cookie_params.copy(),
+            body_params=dependant.body_params.copy(),
+            security_requirements=dependant.security_requirements.copy(),
+        )
+    for sub_dependant in dependant.dependencies:
+        resolved_dependant.dependencies.append(
+            get_resolved_dependant(
+                dependant=sub_dependant, dependency_overrides=dependency_overrides
+            )
+        )
+    return resolved_dependant
+
+
 def get_dependant(
     *,
     path: str,
@@ -269,7 +314,9 @@ def get_dependant(
     name: Optional[str] = None,
     security_scopes: Optional[List[str]] = None,
     use_cache: bool = True,
+    dependency_overrides: Optional[Dict[Callable[..., Any], Callable[..., Any]]] = None,
 ) -> Dependant:
+    call = (dependency_overrides or {}).get(call, call)
     path_param_names = get_path_param_names(path)
     endpoint_signature = get_typed_signature(call)
     signature_params = endpoint_signature.parameters
@@ -294,6 +341,7 @@ def get_dependant(
                 depends=param_details.depends,
                 path=path,
                 security_scopes=security_scopes,
+                dependency_overrides=dependency_overrides,
             )
             dependant.dependencies.append(sub_dependant)
             continue
diff --git a/fastapi/openapi/utils.py b/fastapi/openapi/utils.py
index 808646cc2..47cba8bdf 100644
--- a/fastapi/openapi/utils.py
+++ b/fastapi/openapi/utils.py
@@ -20,6 +20,7 @@ from fastapi.dependencies.utils import (
     _get_flat_fields_from_params,
     get_flat_dependant,
     get_flat_params,
+    get_resolved_dependant,
 )
 from fastapi.encoders import jsonable_encoder
 from fastapi.openapi.constants import METHODS_WITH_BODY, REF_PREFIX, REF_TEMPLATE
@@ -277,8 +278,17 @@ def get_openapi_path(
             operation = get_openapi_operation_metadata(
                 route=route, method=method, operation_ids=operation_ids
             )
+            dependency_overrides = None
+            if route.dependency_overrides_provider:
+                dependency_overrides = (
+                    route.dependency_overrides_provider.dependency_overrides
+                )
+            dependant = get_resolved_dependant(
+                dependant=route.dependant,
+                dependency_overrides=dependency_overrides,
+            )
             parameters: List[Dict[str, Any]] = []
-            flat_dependant = get_flat_dependant(route.dependant, skip_repeats=True)
+            flat_dependant = get_flat_dependant(dependant, skip_repeats=True)
             security_definitions, operation_security = get_openapi_security_definitions(
                 flat_dependant=flat_dependant
             )
@@ -287,7 +297,7 @@ def get_openapi_path(
             if security_definitions:
                 security_schemes.update(security_definitions)
             operation_parameters = _get_openapi_operation_parameters(
-                dependant=route.dependant,
+                dependant=dependant,
                 schema_generator=schema_generator,
                 model_name_map=model_name_map,
                 field_mapping=field_mapping,
@@ -466,6 +476,16 @@ def get_fields_from_routes(
             if route.callbacks:
                 callback_flat_models.extend(get_fields_from_routes(route.callbacks))
             params = get_flat_params(route.dependant)
+            dependency_overrides = None
+            if route.dependency_overrides_provider:
+                dependency_overrides = (
+                    route.dependency_overrides_provider.dependency_overrides
+                )
+            dependant = get_resolved_dependant(
+                dependant=route.dependant,
+                dependency_overrides=dependency_overrides,
+            )
+            params.extend(get_flat_params(dependant))
             request_fields_from_routes.extend(params)
 
     flat_models = callback_flat_models + list(
diff --git a/tests/test_dependency_overrides_openapi.py b/tests/test_dependency_overrides_openapi.py
new file mode 100644
index 000000000..4fee7366b
--- /dev/null
+++ b/tests/test_dependency_overrides_openapi.py
@@ -0,0 +1,201 @@
+from typing import Optional
+
+from fastapi import APIRouter, Depends, FastAPI
+from fastapi._compat import PYDANTIC_V2
+from fastapi.testclient import TestClient
+
+app = FastAPI()
+
+router = APIRouter()
+
+
+async def common_parameters(q: str, skip: int = 0, limit: int = 100):
+    pass  # pragma: no cover
+
+
+@app.get("/main-depends/")
+async def main_depends(commons: dict = Depends(common_parameters)):
+    pass  # pragma: no cover
+
+
+app.include_router(router)
+
+client = TestClient(app)
+
+
+async def overrider_dependency_simple(q: Optional[str] = None):
+    pass  # pragma: no cover
+
+
+async def overrider_sub_dependency(k: str):
+    pass  # pragma: no cover
+
+
+async def overrider_dependency_with_sub(msg: dict = Depends(overrider_sub_dependency)):
+    pass  # pragma: no cover
+
+
+override_simple_openapi_schema = {
+    "openapi": "3.1.0",
+    "info": {"title": "FastAPI", "version": "0.1.0"},
+    "paths": {
+        "/main-depends/": {
+            "get": {
+                "summary": "Main Depends",
+                "operationId": "main_depends_main_depends__get",
+                "parameters": [
+                    {
+                        "required": False,
+                        "schema": {
+                            "anyOf": [{"type": "string"}, {"type": "null"}],
+                            "title": "Q",
+                        },
+                        "name": "q",
+                        "in": "query",
+                    },
+                ],
+                "responses": {
+                    "200": {
+                        "description": "Successful Response",
+                        "content": {"application/json": {"schema": {}}},
+                    },
+                    "422": {
+                        "description": "Validation Error",
+                        "content": {
+                            "application/json": {
+                                "schema": {
+                                    "$ref": "#/components/schemas/HTTPValidationError"
+                                }
+                            }
+                        },
+                    },
+                },
+            }
+        }
+    },
+    "components": {
+        "schemas": {
+            "HTTPValidationError": {
+                "title": "HTTPValidationError",
+                "type": "object",
+                "properties": {
+                    "detail": {
+                        "title": "Detail",
+                        "type": "array",
+                        "items": {"$ref": "#/components/schemas/ValidationError"},
+                    }
+                },
+            },
+            "ValidationError": {
+                "title": "ValidationError",
+                "required": ["loc", "msg", "type"],
+                "type": "object",
+                "properties": {
+                    "loc": {
+                        "title": "Location",
+                        "type": "array",
+                        "items": {"anyOf": [{"type": "string"}, {"type": "integer"}]},
+                    },
+                    "msg": {"title": "Message", "type": "string"},
+                    "type": {"title": "Error Type", "type": "string"},
+                },
+            },
+        }
+    },
+}
+if not PYDANTIC_V2:
+    override_simple_openapi_schema["paths"]["/main-depends/"]["get"]["parameters"][0][
+        "schema"
+    ] = {"title": "Q", "type": "string"}
+
+
+def test_override_simple_openapi():
+    app.dependency_overrides[common_parameters] = overrider_dependency_simple
+    app.openapi_schema = None
+    response = client.get("/openapi.json")
+    assert response.status_code == 200, response.text
+    assert response.json() == override_simple_openapi_schema
+
+
+overrider_dependency_with_sub_schema = {
+    "openapi": "3.1.0",
+    "info": {"title": "FastAPI", "version": "0.1.0"},
+    "paths": {
+        "/main-depends/": {
+            "get": {
+                "summary": "Main Depends",
+                "operationId": "main_depends_main_depends__get",
+                "parameters": [
+                    {
+                        "required": True,
+                        "schema": {"title": "K", "type": "string"},
+                        "name": "k",
+                        "in": "query",
+                    },
+                ],
+                "responses": {
+                    "200": {
+                        "description": "Successful Response",
+                        "content": {"application/json": {"schema": {}}},
+                    },
+                    "422": {
+                        "description": "Validation Error",
+                        "content": {
+                            "application/json": {
+                                "schema": {
+                                    "$ref": "#/components/schemas/HTTPValidationError"
+                                }
+                            }
+                        },
+                    },
+                },
+            }
+        }
+    },
+    "components": {
+        "schemas": {
+            "HTTPValidationError": {
+                "title": "HTTPValidationError",
+                "type": "object",
+                "properties": {
+                    "detail": {
+                        "title": "Detail",
+                        "type": "array",
+                        "items": {"$ref": "#/components/schemas/ValidationError"},
+                    }
+                },
+            },
+            "ValidationError": {
+                "title": "ValidationError",
+                "required": ["loc", "msg", "type"],
+                "type": "object",
+                "properties": {
+                    "loc": {
+                        "title": "Location",
+                        "type": "array",
+                        "items": {"anyOf": [{"type": "string"}, {"type": "integer"}]},
+                    },
+                    "msg": {"title": "Message", "type": "string"},
+                    "type": {"title": "Error Type", "type": "string"},
+                },
+            },
+        }
+    },
+}
+
+
+def test_overrider_dependency_with_sub():
+    app.dependency_overrides[common_parameters] = overrider_dependency_with_sub
+    app.openapi_schema = None
+    response = client.get("/openapi.json")
+    assert response.status_code == 200, response.text
+    assert response.json() == overrider_dependency_with_sub_schema
+
+
+def test_overrider_dependency_with_overriden_sub():
+    app.dependency_overrides[common_parameters] = overrider_dependency_with_sub
+    app.dependency_overrides[overrider_sub_dependency] = overrider_dependency_simple
+    app.openapi_schema = None
+    response = client.get("/openapi.json")
+    assert response.status_code == 200, response.text
+    assert response.json() == override_simple_openapi_schema
diff --git a/tests/test_dependency_security_overrides_openapi.py b/tests/test_dependency_security_overrides_openapi.py
new file mode 100644
index 000000000..70aa5b3ea
--- /dev/null
+++ b/tests/test_dependency_security_overrides_openapi.py
@@ -0,0 +1,107 @@
+from fastapi import Depends, FastAPI, Header
+from fastapi.security import OAuth2PasswordBearer
+from fastapi.testclient import TestClient
+
+app = FastAPI()
+
+
+def get_user_id() -> int:
+    pass  # pragma: no cover
+
+
+def get_user(user_id=Depends(get_user_id)):
+    pass  # pragma: no cover
+
+
+oauth2_scheme = OAuth2PasswordBearer(tokenUrl="token")
+
+
+def get_user_id_from_auth_override(token: str = Depends(oauth2_scheme)):
+    pass  # pragma: no cover
+
+
+def get_user_id_from_header_override(user_id: int = Header()):
+    pass  # pragma: no cover
+
+
+@app.get("/user")
+def read_user(
+    user: str = Depends(get_user),
+):
+    pass  # pragma: no cover
+
+
+client = TestClient(app)
+
+
+override_with_security_schema = {
+    "components": {
+        "securitySchemes": {
+            "OAuth2PasswordBearer": {
+                "flows": {"password": {"scopes": {}, "tokenUrl": "token"}},
+                "type": "oauth2",
+            }
+        }
+    },
+    "info": {"title": "FastAPI", "version": "0.1.0"},
+    "openapi": "3.1.0",
+    "paths": {
+        "/user": {
+            "get": {
+                "operationId": "read_user_user_get",
+                "responses": {
+                    "200": {
+                        "content": {"application/json": {"schema": {}}},
+                        "description": "Successful " "Response",
+                    }
+                },
+                "security": [{"OAuth2PasswordBearer": []}],
+                "summary": "Read User",
+            }
+        }
+    },
+}
+
+
+def test_override_with_security():
+    app.dependency_overrides[get_user_id] = get_user_id_from_auth_override
+    app.openapi_schema = None
+    response = client.get("/openapi.json")
+    assert response.status_code == 200, response.text
+    assert response.json() == override_with_security_schema
+
+
+override_with_header_schema = {
+    "openapi": "3.1.0",
+    "info": {"title": "FastAPI", "version": "0.1.0"},
+    "paths": {
+        "/user": {
+            "get": {
+                "summary": "Read User",
+                "operationId": "read_user_user_get",
+                "parameters": [
+                    {
+                        "name": "user-id",
+                        "in": "header",
+                        "required": True,
+                        "schema": {"type": "integer", "title": "User-Id"},
+                    }
+                ],
+                "responses": {
+                    "200": {
+                        "description": "Successful Response",
+                        "content": {"application/json": {"schema": {}}},
+                    }
+                },
+            }
+        }
+    },
+}
+
+
+def test_override_with_header():
+    app.dependency_overrides[get_user_id] = get_user_id_from_header_override
+    app.openapi_schema = None
+    response = client.get("/openapi.json")
+    assert response.status_code == 200, response.text
+    assert response.json() == override_with_header_schema