diff --git a/pyproject.toml b/pyproject.toml
index 89383f1e..1063c41c 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -42,7 +42,7 @@ langgraph = [
 ]
 test = [
     "black[jupyter]==26.3.1",
-    "isort==8.0.0",
+    "isort==9.0.0",
     "mypy==1.19.1",
     "pytest-asyncio==0.26.0",
     "pytest==8.4.2",