diff --git a/fastapi/dependencies/models.py b/fastapi/dependencies/models.py
index b7dac3f29d..85185e067c 100644
--- a/fastapi/dependencies/models.py
+++ b/fastapi/dependencies/models.py
@@ -28,7 +28,7 @@ def _impartial(func: Callable[..., Any]) -> Callable[..., Any]:
     return func
 
 
-@dataclass
+@dataclass(slots=True)
 class Dependant:
     path_params: list[ModelField] = field(default_factory=list)
     query_params: list[ModelField] = field(default_factory=list)