diff --git a/requirements.txt b/requirements.txt
index 0c80c20..73b3d9b 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,9 +1,10 @@
 ipython[notebook]
 coveralls
 nose2
+pyyaml
 pytest>=2.8
 GitPython==2.1.1
 selenium==2.52.0
 jupyterhub==0.7.2
 docker-py==1.10.6
--e git+https://github.com/jupyter/dockerspawner.git@fdf5577ca2b4087a064507cca8b250e4ad792e02#egg=dockerspawner
\ No newline at end of file
+-e git+https://github.com/jupyter/dockerspawner.git@fdf5577ca2b4087a064507cca8b250e4ad792e02#egg=dockerspawner