diff --git a/pyproject.toml b/pyproject.toml
index 44a23c5..3e74cf6 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -37,7 +37,7 @@ pytest-cov = ">=2.4.0"
 pytest-mypy = "==1.0.1"
 mypy = "==1.19.1"
 pycodestyle = "^2.12.1"
-isort = ">=5.13.2,<7.0.0"
+isort = ">=5.13.2,<10.0.0"
 
 
 [tool.poetry.group.docs]