diff --git a/pyproject.toml b/pyproject.toml
index df12d398..9b0165c9 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -53,7 +53,7 @@ dev = [
     "pytest-mypy==0.10.3",
     "mypy==1.8.0",
     "pycodestyle>=2.12.1,<3",
-    "isort>=5.13.2,<6",
+    "isort>=5.13.2,<9",
     "types-PyYAML>=6.0",
     "types-mock>=5.0",
     "types-redis>=4.0",