diff --git a/app-engine-lab/requirements.txt b/app-engine-lab/requirements.txt
index 635abc2..1fcaa3d 100644
--- a/app-engine-lab/requirements.txt
+++ b/app-engine-lab/requirements.txt
@@ -6,5 +6,5 @@ oauth2client==4.1.2
 Flask-SQLAlchemy==2.3.2
 PyMySQL==0.8.0
 Flask-PyMongo==0.5.1
-PyMongo==3.6.0
+PyMongo==4.6.3
 six==1.11.0