diff --git a/requirements.txt b/requirements.txt
index d530844..03cc5b8 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -11,7 +11,7 @@ pycodestyle==2.2.0
 pyflakes==1.3.0
 python-coveralls==2.9.0
 pytz==2016.7
-PyYAML==3.12
+PyYAML==5.4
 requests==2.12.1
 six==1.10.0
 stripe==1.41.1