diff --git a/requirements.txt b/requirements.txt
index 1e42ffd..0d49b29 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -5,7 +5,7 @@ greenlet==0.4.15
 grpcio==1.18.0
 grpcio-tools==1.18.0
 html5lib==1.0.1
-protobuf==3.9.0
+protobuf==3.18.3
 protobuf-compiler==1.0.20
 six==1.12.0
 termcolor==1.1.0