diff --git a/optional-kubernetes-engine/requirements.txt b/optional-kubernetes-engine/requirements.txt
index 33ba8279..58390f27 100644
--- a/optional-kubernetes-engine/requirements.txt
+++ b/optional-kubernetes-engine/requirements.txt
@@ -9,7 +9,7 @@ mock==2.0.0
 Flask-SQLAlchemy==2.3.2
 PyMySQL==0.9.2
 Flask-PyMongo==2.3.0
-PyMongo==3.7.2
+PyMongo==4.6.3
 six==1.11.0
 requests[security]==2.21.0
 honcho==1.0.1