diff --git a/requirements.txt b/requirements.txt
index 5396c24..3714f49 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -11,6 +11,7 @@ flake8==2.5.0
 iso8601==0.1.11
 markdown2==2.3.0
 max-django-mail-templated==1.2
+PyYAML==3.11
 requests==2.9.1
 requests-mock==0.7.0
 whitenoise==2.0.6