diff --git a/flaskservice/requirements.txt b/flaskservice/requirements.txt
index 00ec441..917c240 100644
--- a/flaskservice/requirements.txt
+++ b/flaskservice/requirements.txt
@@ -30,7 +30,7 @@ numpy==1.18.0
 oauthlib==3.1.0
 opt-einsum==3.1.0
 Pillow==7.0.0
-protobuf==3.11.2
+protobuf==3.15.0
 pyasn1==0.4.8
 pyasn1-modules==0.2.7
 python-dateutil==2.8.1