diff --git a/requirements.txt b/requirements.txt
index bbf24e6..72a86f4 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -5,7 +5,7 @@ nltk==3.4.5
 numpy==1.17.2
 pandas==0.25.1
 pick==0.6.4
-protobuf==3.9.1
+protobuf==3.15.0
 python-dateutil==2.8.0
 pytz==2019.2
 requests==2.22.0