diff --git a/requirements.txt b/requirements.txt
index 3086f53..a3e06dd 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -40,7 +40,7 @@ nltk==3.4.5
 numpy==1.16.4
 pandas==0.25.1
 Pillow==6.2.0
-protobuf==3.9.1
+protobuf==3.15.0
 pycorenlp==0.3.0
 PyJWT==1.7.1
 python-dateutil==2.8.0