diff --git a/retail/recommendation-system/bqml-scann/index_server/requirements.txt b/retail/recommendation-system/bqml-scann/index_server/requirements.txt
index 3e7abb0..c389f40 100644
--- a/retail/recommendation-system/bqml-scann/index_server/requirements.txt
+++ b/retail/recommendation-system/bqml-scann/index_server/requirements.txt
@@ -1,5 +1,5 @@
 pip==20.2.4
 Flask==1.1.2
-gunicorn==20.0.4
+gunicorn==23.0.0
 google-api-python-client==1.12.5
 scann==1.1.1
\ No newline at end of file