diff --git a/REQUIREMENTS.txt b/REQUIREMENTS.txt
index 301d24a..d21e734 100644
--- a/REQUIREMENTS.txt
+++ b/REQUIREMENTS.txt
@@ -10,7 +10,7 @@ jsonfield==2.0.2
 Markdown==3.0.1
 Pygments==2.3.1
 pytz==2017.3
-PyYAML==3.13
+PyYAML==5.1
 requests==2.18.4
 six==1.11.0
 slackclient==1.2.1