diff --git a/requirements.txt b/requirements.txt
index 50a7927..15d4915 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -2,6 +2,6 @@ aniso8601==1.2.0
 Flask==0.12.1
 cryptography==2.1.4
 pyOpenSSL==17.0.0
-PyYAML==3.12
+PyYAML==3.13
 six==1.11.0