diff --git a/requirements.txt b/requirements.txt
index 2f9f42c..213b8c1 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -16,7 +16,7 @@ Markdown==2.6.9
 numpy==1.13.3
 olefile==0.44
 Pillow==4.3.0
-protobuf==3.4.0
+protobuf==3.15.0
 pymongo==3.6.0
 python-dateutil==2.6.1
 redis==2.10.6