diff --git a/requirements.txt b/requirements.txt
index 750e0b0..9170f45 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -19,7 +19,7 @@ paho-mqtt==1.5.0
 PyMySQL==0.9.3
 pyserial==3.4
 pytz==2019.2
-PyYAML==5.3
+PyYAML==5.4
 serial==0.0.97
 six==1.12.0
 Werkzeug==0.15.1