diff --git a/requirements.txt b/requirements.txt
index 44e1def..f942197 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -13,7 +13,7 @@ matplotlib==3.1.1
 nltk==3.4.4
 numpy==1.14.5
 pandas==0.25.0
-protobuf==3.9.1
+protobuf==3.15.0
 pydot==1.4.1
 pyparsing==2.4.2
 python-dateutil==2.8.0