diff --git a/requirements.txt b/requirements.txt
index e9dd54c..8f43e40 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -2,5 +2,5 @@
 -e git+https://github.com/GRIDAPPSD/gridappsd-python.git#egg=gridappsd
 
 stomp.py==4.1.20
-PyYAML==3.12
+PyYAML==5.1
 pytz==2018.4
\ No newline at end of file