diff --git a/src/example/note/use_case.py b/src/example/note/use_case.py
index 7a767c4..ff1bc4b 100644
--- a/src/example/note/use_case.py
+++ b/src/example/note/use_case.py
@@ -7,13 +7,13 @@
 from .repository import NoteRepositoryInterface
 
 
-@dataclass(frozen=True)
+@dataclass(frozen=True, slots=True)
 class ListNotesInput:
     limit: int
     offset: int
 
 
-@dataclass(frozen=True)
+@dataclass(frozen=True, slots=True)
 class ListNotesOutput:
     items: list[Note]
     limit: int
@@ -36,7 +36,7 @@ def execute(self, input_: ListNotesInput) -> ListNotesOutput:
         )
 
 
-@dataclass(frozen=True)
+@dataclass(frozen=True, slots=True)
 class CreateNoteInput:
     title: str
     body: str
@@ -61,7 +61,7 @@ def execute(self, note_id: int) -> Note:
         return note
 
 
-@dataclass(frozen=True)
+@dataclass(frozen=True, slots=True)
 class UpdateNoteInput:
     note_id: int
     title: str
@@ -79,7 +79,7 @@ def execute(self, input_: UpdateNoteInput) -> Note:
         return note
 
 
-@dataclass(frozen=True)
+@dataclass(frozen=True, slots=True)
 class DeleteNoteInput:
     note_id: int
 
diff --git a/src/example/tag/use_case.py b/src/example/tag/use_case.py
index cb0e4a5..1c429c6 100644
--- a/src/example/tag/use_case.py
+++ b/src/example/tag/use_case.py
@@ -7,13 +7,13 @@
 from .repository import TagRepositoryInterface
 
 
-@dataclass(frozen=True)
+@dataclass(frozen=True, slots=True)
 class ListTagsInput:
     limit: int
     offset: int
 
 
-@dataclass(frozen=True)
+@dataclass(frozen=True, slots=True)
 class ListTagsOutput:
     items: list[Tag]
     limit: int
@@ -47,7 +47,7 @@ def execute(self, tag_id: int) -> Tag:
         return tag
 
 
-@dataclass(frozen=True)
+@dataclass(frozen=True, slots=True)
 class CreateTagInput:
     name: str
 
@@ -60,7 +60,7 @@ def execute(self, input_: CreateTagInput) -> Tag:
         return self._repository.save(input_.name)
 
 
-@dataclass(frozen=True)
+@dataclass(frozen=True, slots=True)
 class UpdateTagInput:
     tag_id: int
     name: str
@@ -77,7 +77,7 @@ def execute(self, input_: UpdateTagInput) -> Tag:
         return tag
 
 
-@dataclass(frozen=True)
+@dataclass(frozen=True, slots=True)
 class DeleteTagInput:
     tag_id: int