diff --git a/scripts/requirements-simple.txt b/scripts/requirements-simple.txt
index e82e9e54..36579b05 100644
--- a/scripts/requirements-simple.txt
+++ b/scripts/requirements-simple.txt
@@ -1,3 +1,4 @@
 requests==2.9.1
 six==1.10.0
+PyYAML==3.11
 ujson==1.33
\ No newline at end of file