diff --git a/pyproject.toml b/pyproject.toml
index e299e43..2b9f857 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -39,7 +39,7 @@ Changelog = "https://github.com/googleapis/llama-index-cloud-sql-pg-python/blob/
 [project.optional-dependencies]
 test = [
     "black[jupyter]==26.5.1",
-    "isort==8.0.1",
+    "isort==9.0.1",
     "mypy==2.3.1",
     "pytest-asyncio==1.4.0",
     "pytest==9.1.1",