diff --git a/crcsim/experiment/prepare.py b/crcsim/experiment/prepare.py
index 8281562..3c47089 100644
--- a/crcsim/experiment/prepare.py
+++ b/crcsim/experiment/prepare.py
@@ -1,8 +1,9 @@
 import json
 import random
+from copy import deepcopy
 from pathlib import Path
 from typing import Callable, Dict, List, Optional
-from copy import deepcopy
+
 
 import fire