diff --git a/requirements.txt b/requirements.txt
index 63380402..15104589 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -73,7 +73,7 @@ pytest==4.0.1
 python-dateutil==2.7.5
 pytz==2018.7
 PyWavelets==1.0.1
-PyYAML==5.1
+PyYAML==5.4
 psutil==5.4.8
 ray[rllib,debug]==0.6.6
 redis==3.0.1