diff --git a/requirements.txt b/requirements.txt
index 0381ecb..bce676d 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -8,7 +8,7 @@ gym==0.10.9
 idna==2.7
 numpy==1.15.4
 Pillow==5.3.0
-protobuf==3.6.1
+protobuf==3.18.3
 pyglet==1.3.2
 requests==2.20.1
 scipy==1.1.0