diff --git a/requirements.txt b/requirements.txt
index 1910e75..cc24ff8 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -22,7 +22,7 @@ itsdangerous==1.1.0
 Jinja2==2.11.3
 MarkupSafe==1.1.1
 msgpack==0.6.2
-protobuf==3.11.2
+protobuf==3.18.3
 pyasn1==0.4.8
 pyasn1-modules==0.2.8
 pytz==2019.3