diff --git a/environment/requirements.txt b/environment/requirements.txt
index 6ad9b6d5..663d0402 100644
--- a/environment/requirements.txt
+++ b/environment/requirements.txt
@@ -63,7 +63,7 @@ pytest==4.5.0
 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]==0.7.0
 redis==3.0.1