diff --git a/requirements.txt b/requirements.txt
index 94bfef0..bf9b364 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -2,4 +2,4 @@ Flask==0.10.1
 Jinja2==2.8
 ply==3.9
 lxml==3.6.4
-PyYAML==3.12
+PyYAML==5.1