diff --git a/Flask/requirements.txt b/Flask/requirements.txt
index 010e6c8..4805774 100644
--- a/Flask/requirements.txt
+++ b/Flask/requirements.txt
@@ -32,7 +32,7 @@ nltk==3.4.5
 numpy==1.17.4
 opt-einsum==3.1.0
 pandas==0.25.3
-protobuf==3.11.0
+protobuf==3.15.0
 python-dateutil==2.8.0
 pytz==2019.3
 PyYAML==5.1.2