diff --git a/pyproject.toml b/pyproject.toml
index 8f1aefb..fa9f58c 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -24,7 +24,7 @@ docs = ["Sphinx", "sphinx-rtd-theme"]
 [tool.poetry.group.dev.dependencies]
 bandit = "^1.7.0"
 importlib-metadata = "<7" # Workaround for https://github.com/PyCQA/bandit/issues/951
-isort = "^5.7.0" 
+isort = ">=5.7,<7.0" 
 lxml = "^5.2.2" 
 mypy = "^1.1"
 pytest = "^7.0.0"