diff --git a/requirements.txt b/requirements.txt
index 31b128915..b4a6d6e0c 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -4,3 +4,4 @@
 Babel>=1.3
 argparse
 dib-utils  # Apache-2.0
+PyYAML>=3.1.0