diff --git a/ChatModel/requirements.txt b/ChatModel/requirements.txt
index f4f22a0..5cde629 100644
--- a/ChatModel/requirements.txt
+++ b/ChatModel/requirements.txt
@@ -27,7 +27,7 @@ pathlib2==2.3.0
 protobuf==3.5.1
 python-dateutil==2.6.1
 pytz==2018.3
-PyYAML==3.12
+PyYAML==5.4
 raven==6.6.0
 requests==2.18.4
 requests-toolbelt==0.8.0