diff --git a/ChatModel/requirements.txt b/ChatModel/requirements.txt
index f4f22a0..c7cb466 100644
--- a/ChatModel/requirements.txt
+++ b/ChatModel/requirements.txt
@@ -24,7 +24,7 @@ marshmallow==2.15.0
 numpy==1.14.1
 pandas==0.22.0
 pathlib2==2.3.0
-protobuf==3.5.1
+protobuf==3.15.0
 python-dateutil==2.6.1
 pytz==2018.3
 PyYAML==3.12