diff --git a/flask-server/requirements.txt b/flask-server/requirements.txt
index 2e93968f..49b5054d 100644
--- a/flask-server/requirements.txt
+++ b/flask-server/requirements.txt
@@ -28,7 +28,7 @@ Jinja2==2.11.2
 MarkupSafe==1.1.1
 oauth2client==4.1.3
 pip==20.2.1
-protobuf==3.12.2
+protobuf==3.15.0
 pyasn1==0.4.8
 pyasn1-modules==0.2.8
 pycparser==2.20