diff --git a/src/pylogit/choice_tools.py b/src/pylogit/choice_tools.py
index c9653d7..64fae52 100644
--- a/src/pylogit/choice_tools.py
+++ b/src/pylogit/choice_tools.py
@@ -12,7 +12,7 @@
 
 import warnings
 from collections import OrderedDict
-from collections import Iterable
+from collections.abc import Iterable  # ✅ Funciona en Python ≥ 3.3
 from numbers import Number
 
 import numpy as np