diff --git a/requirements.txt b/requirements.txt
index 4ac6625..2462066 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -32,7 +32,7 @@ numpy==1.13.3
 olefile==0.44
 pendulum==1.3.0
 Pillow==4.3.0
-protobuf==3.4.0
+protobuf==3.15.0
 pycparser==2.18
 pymongo==3.5.1
 python-dateutil==2.6.1