diff --git a/requirements.txt b/requirements.txt
index eaeb66e..c8036d3 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -3,7 +3,7 @@ Keras==2.0.6
 numpy==1.13.3
 olefile==0.44
 Pillow==4.3.0
-protobuf==3.4.0
+protobuf==3.15.0
 PyYAML==3.12
 scipy==0.19.1
 six==1.11.0