diff --git a/samples/index_tuning_sample/requirements.txt b/samples/index_tuning_sample/requirements.txt
index 35c0439f..42e720ac 100644
--- a/samples/index_tuning_sample/requirements.txt
+++ b/samples/index_tuning_sample/requirements.txt
@@ -1,3 +1,3 @@
 langchain-community==0.3.29
 langchain-google-cloud-sql-pg==0.14.1
-langchain-google-vertexai==2.0.28
+langchain-google-vertexai==2.1.2