diff --git a/requirements.txt b/requirements.txt
index a30665b..3600580 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -23,7 +23,7 @@ Pillow==5.3.0
 pluggy==0.7.1
 portpicker==1.2.0
 probscale==0.2.3
-protobuf==3.6.1
+protobuf==3.15.0
 py==1.6.0
 pygame==1.9.4
 pyparsing==2.2.2