diff --git a/requirements.txt b/requirements.txt
index d41c048..504d001 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -45,7 +45,7 @@ pickleshare==0.7.5
 pillow>=7.1.0
 pluggy==0.12.0
 prompt-toolkit==2.0.9
-protobuf==3.6.1
+protobuf==3.15.0
 py==1.8.0
 pycodestyle==2.5.0
 pyglet==1.3.2