diff --git a/pruners/wilcoxon_pruner_tsp_sa.py b/pruners/wilcoxon_pruner_tsp_sa.py
index f9b642a9..2ee3c75a 100644
--- a/pruners/wilcoxon_pruner_tsp_sa.py
+++ b/pruners/wilcoxon_pruner_tsp_sa.py
@@ -1,10 +1,10 @@
+from dataclasses import dataclass
 import math
 import sys
-from dataclasses import dataclass
 
 import numpy as np
-import optuna
 from numpy.linalg import norm
+import optuna
 
 
 @dataclass