diff --git a/DocApp/requirements.txt b/DocApp/requirements.txt
index d673276..958f64b 100644
--- a/DocApp/requirements.txt
+++ b/DocApp/requirements.txt
@@ -21,7 +21,7 @@ grpcio==1.28.1
 httplib2==0.17.2
 idna==2.9
 msgpack==1.0.0
-protobuf==3.11.3
+protobuf==3.15.0
 pyasn1==0.4.8
 pyasn1-modules==0.2.8
 pycryptodome==3.9.7