diff --git a/src/example/note/handler.py b/src/example/note/handler.py
index 5e06bb9..01c7a31 100644
--- a/src/example/note/handler.py
+++ b/src/example/note/handler.py
@@ -10,9 +10,13 @@
 from .use_case import (
     CreateNoteInput,
     CreateNoteUseCase,
+    DeleteNoteInput,
+    DeleteNoteUseCase,
     GetNoteUseCase,
     ListNotesInput,
     ListNotesUseCase,
+    UpdateNoteInput,
+    UpdateNoteUseCase,
 )
 
 router = APIRouter(prefix="/notes", tags=["notes"])
@@ -23,10 +27,17 @@ class CreateNoteBody(BaseModel):
     body: str
 
 
+class UpdateNoteBody(BaseModel):
+    title: str
+    body: str
+
+
 def make_note_router(
     list_use_case: ListNotesUseCase,
     get_use_case: GetNoteUseCase,
     create_use_case: CreateNoteUseCase,
+    update_use_case: UpdateNoteUseCase,
+    delete_use_case: DeleteNoteUseCase,
 ) -> APIRouter:
     @router.get("")
     async def list_notes(request: Request) -> JSONResponse:
@@ -59,4 +70,19 @@ async def create_note(body: CreateNoteBody) -> JSONResponse:
             {"id": note.id, "title": note.title, "body": note.body}, status_code=201
         )
 
+    @router.put("/{note_id}")
+    async def update_note(note_id: int, body: UpdateNoteBody) -> JSONResponse:
+        errors: list[ValidationError] = []
+        if not body.title.strip():
+            errors.append(ValidationError("title", "Title must not be empty.", "required"))
+        if errors:
+            raise ValidationException(errors)
+
+        note = update_use_case.execute(UpdateNoteInput(note_id, body.title, body.body))
+        return JSONResponse({"id": note.id, "title": note.title, "body": note.body})
+
+    @router.delete("/{note_id}", status_code=204)
+    async def delete_note(note_id: int) -> None:
+        delete_use_case.execute(DeleteNoteInput(note_id))
+
     return router
diff --git a/src/example/note/repository.py b/src/example/note/repository.py
index b6bbbe3..7391211 100644
--- a/src/example/note/repository.py
+++ b/src/example/note/repository.py
@@ -15,6 +15,12 @@ def find_by_id(self, note_id: int) -> Note | None: ...
     @abstractmethod
     def save(self, title: str, body: str) -> Note: ...
 
+    @abstractmethod
+    def update(self, note_id: int, title: str, body: str) -> Note | None: ...
+
+    @abstractmethod
+    def delete(self, note_id: int) -> bool: ...
+
     @abstractmethod
     def count(self) -> int: ...
 
@@ -39,5 +45,18 @@ def save(self, title: str, body: str) -> Note:
         self._next_id += 1
         return note
 
+    def update(self, note_id: int, title: str, body: str) -> Note | None:
+        if note_id not in self._store:
+            return None
+        updated = Note(id=note_id, title=title, body=body)
+        self._store[note_id] = updated
+        return updated
+
+    def delete(self, note_id: int) -> bool:
+        if note_id not in self._store:
+            return False
+        del self._store[note_id]
+        return True
+
     def count(self) -> int:
         return len(self._store)
diff --git a/src/example/note/use_case.py b/src/example/note/use_case.py
index c6fa665..7a767c4 100644
--- a/src/example/note/use_case.py
+++ b/src/example/note/use_case.py
@@ -59,3 +59,36 @@ def execute(self, note_id: int) -> Note:
         if note is None:
             raise NoteNotFoundException(note_id)
         return note
+
+
+@dataclass(frozen=True)
+class UpdateNoteInput:
+    note_id: int
+    title: str
+    body: str
+
+
+class UpdateNoteUseCase:
+    def __init__(self, repository: NoteRepositoryInterface) -> None:
+        self._repository = repository
+
+    def execute(self, input_: UpdateNoteInput) -> Note:
+        note = self._repository.update(input_.note_id, input_.title, input_.body)
+        if note is None:
+            raise NoteNotFoundException(input_.note_id)
+        return note
+
+
+@dataclass(frozen=True)
+class DeleteNoteInput:
+    note_id: int
+
+
+class DeleteNoteUseCase:
+    def __init__(self, repository: NoteRepositoryInterface) -> None:
+        self._repository = repository
+
+    def execute(self, input_: DeleteNoteInput) -> None:
+        deleted = self._repository.delete(input_.note_id)
+        if not deleted:
+            raise NoteNotFoundException(input_.note_id)
diff --git a/tests/example/note/test_list_notes.py b/tests/example/note/test_list_notes.py
index 06d329b..5e78436 100644
--- a/tests/example/note/test_list_notes.py
+++ b/tests/example/note/test_list_notes.py
@@ -42,6 +42,47 @@ def test_get_nonexistent_note_returns_404() -> None:
     assert r.status_code == 404
 
 
+def test_update_note_returns_200() -> None:
+    client = _client()
+    r = client.post("/notes", json={"title": "Old", "body": "Old body"})
+    note_id = r.json()["id"]
+
+    r2 = client.put(f"/notes/{note_id}", json={"title": "New", "body": "New body"})
+    assert r2.status_code == 200
+    assert r2.json()["title"] == "New"
+    assert r2.json()["body"] == "New body"
+
+
+def test_update_nonexistent_note_returns_404() -> None:
+    r = _client().put("/notes/9999", json={"title": "T", "body": "B"})
+    assert r.status_code == 404
+
+
+def test_update_note_empty_title_returns_422() -> None:
+    client = _client()
+    r = client.post("/notes", json={"title": "T", "body": "B"})
+    note_id = r.json()["id"]
+    r2 = client.put(f"/notes/{note_id}", json={"title": "", "body": "B"})
+    assert r2.status_code == 422
+
+
+def test_delete_note_returns_204() -> None:
+    client = _client()
+    r = client.post("/notes", json={"title": "T", "body": "B"})
+    note_id = r.json()["id"]
+
+    r2 = client.delete(f"/notes/{note_id}")
+    assert r2.status_code == 204
+
+    r3 = client.get(f"/notes/{note_id}")
+    assert r3.status_code == 404
+
+
+def test_delete_nonexistent_note_returns_404() -> None:
+    r = _client().delete("/notes/9999")
+    assert r.status_code == 404
+
+
 def test_health() -> None:
     r = _client().get("/health")
     assert r.status_code == 200