diff --git a/requirements.txt b/requirements.txt
index e1715c2..da9e261 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -9,7 +9,7 @@ nltk==3.4.4
 numpy==1.15.0
 Pillow==6.1.0
 pkg-resources==0.0.0
-protobuf==3.9.0
+protobuf==3.15.0
 pyparsing==2.4.2
 python-dateutil==2.8.0
 six==1.12.0