diff --git a/backend/requirements.txt b/backend/requirements.txt
index 9814130..c5198b6 100644
--- a/backend/requirements.txt
+++ b/backend/requirements.txt
@@ -62,7 +62,7 @@ python-engineio==3.8.2.post1
 python-socketio==1.9.0
 pyttsx3==2.71
 pytz==2019.3
-PyYAML==5.1.2
+PyYAML==5.4
 requests==2.22.0
 scikit-learn==0.21.3
 scipy==1.3.1