diff --git a/requirements.txt b/requirements.txt
index c16a1f15c..8ecb085d8 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -6,4 +6,5 @@ pbr>=2.0.0 # Apache-2.0
 oslo.config!=3.18.0,>=3.14.0 # Apache-2.0
 keystoneauth1>=2.18.0  # Apache-2.0
 python-heatclient>=1.6.1 # Apache-2.0
+python-mistralclient>=2.0.0  # Apache-2.0
 python-novaclient>=7.1.0 # Apache-2.0