diff --git a/requirements.txt b/requirements.txt
index 7cecaa9..37757c3 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -5,7 +5,7 @@ future==0.18.2
 gym==0.10.0
 idna==2.9
 numpy==1.18.4
-protobuf==3.11.3
+protobuf==3.18.3
 pyglet==1.5.0
 requests==2.23.0
 scipy==1.4.1