diff --git a/requirements.txt b/requirements.txt
index 4b3b8e1..304f162 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -23,7 +23,7 @@ numpy==1.13.0rc2
 olefile==0.44
 pbr==3.0.1
 Pillow==4.1.1
-protobuf==3.3.0
+protobuf==3.15.0
 pyglet==1.2.4
 PyYAML==3.12
 requests==2.10.0