diff --git a/pyproject.toml b/pyproject.toml
index 5969dab..63d3605 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -47,7 +47,7 @@ pytest-django = "^4.9.0"
 pytest-cov = "^6.0.0"
 coverage = {extras = ["toml"], version = "^7.6.0"}
 black = "^25.1.0"
-isort = "^6.0.1"
+isort = ">=6.0.1,<9.0.0"
 flake8 = "^7.1.1"
 mypy = "^1.13.0"
 pre-commit = "^4.0.1"