diff --git a/pyproject.toml b/pyproject.toml
index 70a14d6..ff7b75f 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -43,7 +43,7 @@ pytest-cov = "^4.1.0"
 pytest-rerunfailures = "^12.0.0"
 flake8 = "^6.1.0"
 black = "^23.7.0"
-isort = "^5.12.0"
+isort = ">=5.12,<7.0"
 mypy = "^1.5.0"
 ipython = "^8.14.0"
 setuptools = ">=78.1.1"