diff --git a/requirements/requirements-optionals.txt b/requirements/requirements-optionals.txt
index 87cdb82da..cd0f1f62b 100644
--- a/requirements/requirements-optionals.txt
+++ b/requirements/requirements-optionals.txt
@@ -5,3 +5,4 @@ django-guardian==1.4.9
 django-filter==1.1.0
 coreapi==2.3.1
 coreschema==0.0.4
+pyyaml