diff --git a/600/requirements.txt b/600/requirements.txt
index 06d1d35..aa08d7a 100644
--- a/600/requirements.txt
+++ b/600/requirements.txt
@@ -8,6 +8,6 @@ pyparsing==2.2.0
 pytest==3.2.3
 python-dateutil==2.6.1
 pytz==2017.2
-PyYAML==3.12
+PyYAML==5.4
 six==1.11.0
 watchdog==0.8.3