diff --git a/requirements.txt b/requirements.txt
index 5d2fbc0..9addc83 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -7,7 +7,7 @@ kiwisolver==1.2.0
 matplotlib==3.2.1
 numpy==1.18.2
 Pillow==7.1.1
-protobuf==3.11.3
+protobuf==3.15.0
 pybullet==2.7.2
 pyglet==1.5.0
 pyparsing==2.4.7