diff --git a/script/gen_requirements_all.py b/script/gen_requirements_all.py
index 81fea80efad..7d587d761ec 100755
--- a/script/gen_requirements_all.py
+++ b/script/gen_requirements_all.py
@@ -426,7 +426,7 @@ def gather_constraints() -> str:
                     *gather_recursive_requirements("default_config"),
                     *gather_recursive_requirements("mqtt"),
                 },
-                key=lambda name: name.lower(),
+                key=str.lower,
             )
             + [""]
         )