diff --git a/requirements.txt b/requirements.txt
index e726850ce93d17345811fd98e565eed514c051a3..9ec2d69355f443b15cef75047a224e645b961f5c 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,2 +1,4 @@
 - Python 3
 - Jinja 2.10
+- PyYAML 3.12
+