diff --git a/samples/index_tuning_sample/requirements.txt b/samples/index_tuning_sample/requirements.txt
index 5d02f63a..69db9964 100644
--- a/samples/index_tuning_sample/requirements.txt
+++ b/samples/index_tuning_sample/requirements.txt
@@ -1,3 +1,3 @@
 langchain-community==0.4.2
 langchain-google-cloud-sql-pg==0.15.0
-langchain-google-vertexai==3.2.3
+langchain-google-vertexai==3.2.4