diff --git a/requirements.txt b/requirements.txt
index 609d3b2..eabb98e 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -3,7 +3,7 @@ Cheetah==2.4.1
 Cython==0.21.1
 FAST==2.5
 Markdown==2.4.1
-PyYAML==3.10
+PyYAML==5.1
 Pygments==1.4
 argparse==1.2.1
 awscli==1.5.1