diff --git a/requirements.txt b/requirements.txt
index ede1dbe..679c8f0 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -25,7 +25,7 @@ itsdangerous==0.24
 Jinja2>=2.10.1
 MarkupSafe==1.0
 msgpack==0.5.6
-protobuf==3.6.0
+protobuf==3.18.3
 pyasn1==0.4.4
 pyasn1-modules==0.2.2
 pytz==2018.5