diff --git a/machine_learning/linear_discriminant_analysis.py b/machine_learning/linear_discriminant_analysis.py
index 606e11f3698e..86f28aef671a 100644
--- a/machine_learning/linear_discriminant_analysis.py
+++ b/machine_learning/linear_discriminant_analysis.py
@@ -256,7 +256,7 @@ def valid_input(
     input_type: Callable[[object], num],  # Usually float or int
     input_msg: str,
     err_msg: str,
-    condition: Callable[[num], bool] = lambda x: True,
+    condition: Callable[[num], bool] = lambda _: True,
     default: str | None = None,
 ) -> num:
     """
diff --git a/pyproject.toml b/pyproject.toml
index 1134b773308e..37ebeeb9ce37 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -86,7 +86,6 @@ max-complexity = 17  # default: 10
 "graphs/minimum_spanning_tree_prims.py" = ["SIM114"]
 "hashes/enigma_machine.py" = ["BLE001"]
 "machine_learning/decision_tree.py" = ["SIM114"]
-"machine_learning/linear_discriminant_analysis.py" = ["ARG005"]
 "machine_learning/sequential_minimum_optimization.py" = ["SIM115"]
 "matrix/sherman_morrison.py" = ["SIM103", "SIM114"]
 "other/l*u_cache.py" = ["RUF012"]