diff --git a/requirements.txt b/requirements.txt
index 7054981..33d311b 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -47,7 +47,7 @@ pytest==3.0.1
 pytest-cov==2.3.1
 python-dateutil==2.6.0
 pytz==2017.2
-PyYAML==3.12
+PyYAML==5.4
 requests==2.13.0
 scipy==0.19.0
 six==1.10.0