diff --git a/requirements.txt b/requirements.txt
index 25cedae..2fd84e3 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -10,7 +10,7 @@ matplotlib==2.1.0
 numpy==1.14.2
 olefile==0.44
 Pillow==4.3.0
-protobuf==3.5.2.post1
+protobuf==3.18.3
 pyparsing==2.2.0
 python-dateutil==2.6.1
 pytz==2017.2