diff --git a/requirements.txt b/requirements.txt
index 09457bc..a5c6779 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -17,7 +17,7 @@ multidict==5.1.0
 numpy==1.19.3
 pipenv==2020.11.15
 portpicker==1.3.1
-protobuf==3.15.8
+protobuf==3.18.3
 pyglet==1.5.16
 python-json-logger==2.0.1
 s2clientprotocol==5.0.7.84643.0