diff --git a/requirements.txt b/requirements.txt
index 2060926..746d3f0 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -5,7 +5,7 @@ py==1.4.31
 pytest==2.9.2
 python-dateutil==2.5.3
 pytz==2016.4
-PyYAML==5.1
+PyYAML==5.4
 six==1.10.0
 smmap==0.9.0
 wcwidth==0.1.6