diff --git a/requirements.txt b/requirements.txt
index 8bc8d9c..43940a3 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -13,7 +13,7 @@ Markdown==2.6.11
 numpy==1.14.0
 olefile==0.44
 Pillow==4.3.0
-protobuf==3.5.1
+protobuf==3.15.0
 python-dateutil==2.6.1
 redis==2.10.6
 s3transfer==0.1.12