diff --git a/requirements.txt b/requirements.txt
index f589382..53e34a0 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -6,7 +6,7 @@ enum34==1.1.6
 futures==3.3.0 ; python_version < '3.2'
 grpcio==1.24.0
 ipaddress==1.0.22 ; python_version < '3'
-protobuf==3.9.2
+protobuf==3.18.3
 pycparser==2.19
 six==1.12.0
 pytest==5.2.1