diff --git a/requirements.txt b/requirements.txt
index ce93f35..34642dd 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,5 +1,6 @@
 gevent==1.2.2
 holster==2.0.0
+pyyaml==3.12
 requests==2.18.4
 six==1.11.0
 websocket-client==0.44.0