diff --git a/requirements.txt b/requirements.txt
index f0c84e0d..6add6571 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -20,7 +20,7 @@ matplotlib==2.1.0
 numpy==1.16.2
 olefile==0.46
 Pillow==4.3.0
-protobuf==3.6.0
+protobuf==3.18.3
 pyparsing==2.4.0
 python-dateutil==2.8.0
 pytz==2018.9