diff --git a/requirements.txt b/requirements.txt
index f9dd44b..a0314a0 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -11,7 +11,7 @@ numpy==1.13.3
 olefile==0.44
 pbr==3.1.1
 Pillow==4.3.0
-protobuf==3.4.0
+protobuf==3.15.0
 pyparsing==2.2.0
 python-dateutil==2.6.1
 pytz==2017.3