diff --git a/tox.ini b/tox.ini
index 8069efb..742c270 100644
--- a/tox.ini
+++ b/tox.ini
@@ -34,7 +34,7 @@ basepython = python3.6
 deps =
     flake8==3.9.2
     black==21.5b1
-    isort==5.8.0
+    isort==5.9.3
 commands =
     flake8 django_migration_linter/
     black --check django_migration_linter/ tests/ manage.py setup.py