diff --git a/app/main.py b/app/main.py
index 9455d6da..b6c94703 100644
--- a/app/main.py
+++ b/app/main.py
@@ -42,7 +42,7 @@ def bring_slippers() -> None:
         print("The slippers delivered!")
 
 
-def feed_animals(animals: list) -> int:
+def feed_animals(animals: list[Animal]) -> int:
     return sum(
         animal.feed() for animal in animals if animal.is_hungry
     )