diff --git a/requirements.txt b/requirements.txt
index 2363cbf..bbb64c2 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -11,7 +11,7 @@ Jinja2==2.9.6
 MarkupSafe==1.0
 openapi-codec==1.3.2
 pytz==2017.2
-PyYAML==3.12
+PyYAML==5.4
 requests==2.18.4
 simplejson==3.11.1
 uritemplate==3.0.0