diff --git a/requirements.txt b/requirements.txt
index 46174c8..808106a 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -11,7 +11,7 @@ Markdown==2.6.11
 matplotlib==2.1.2
 numpy==1.14.0
 Pillow==5.0.0
-protobuf==3.5.1
+protobuf==3.18.3
 pyparsing==2.2.0
 python-dateutil==2.6.1
 pytz==2018.3