diff --git a/requirements.txt b/requirements.txt
index a90e5ac..7796c66 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -7,7 +7,7 @@ kiwisolver==1.0.1
 Markdown==2.6.11
 matplotlib==2.2.2
 numpy==1.14.5
-protobuf==3.6.0
+protobuf==3.15.0
 pyparsing==2.2.0
 python-dateutil==2.7.3
 pytz==2018.5