diff --git a/tools/tools.py b/tools/tools.py
index e235655..824c1a1 100644
--- a/tools/tools.py
+++ b/tools/tools.py
@@ -3,7 +3,7 @@ import inspect
 import os.path
 import sys
 from functools import wraps
-from typing import Any
+from typing import Any, Union
 
 
 def get_script_dir(follow_symlinks: bool = True) -> str:
@@ -27,7 +27,7 @@ def compare(a: Any, b: Any) -> int:
     return bool(a > b) - bool(a < b)
 
 
-def minmax(*arr: tuple) -> (Any, Any):
+def minmax(*arr: Any) -> (Any, Any):
     """return the min and max value of an array (or arbitrary amount of arguments)"""
     if len(arr) == 1:
         if isinstance(arr[0], list):