diff --git a/requirements.txt b/requirements.txt
index c69cce9..6e7028e 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -40,7 +40,7 @@ mysql-connector==2.2.9
 mysql-connector-python==8.0.18
 mysqlclient==1.4.6
 passlib==1.7.2
-protobuf==3.11.2
+protobuf==3.15.0
 psycopg2==2.8.5
 pyasn1==0.4.8
 pyasn1-modules==0.2.7