diff --git a/requirements.txt b/requirements.txt
index 2bea0eef..21624085 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -15,3 +15,4 @@ keystoneauth1>=3.9.0 # Apache-2.0
 keystonemiddleware>=4.17.0 # Apache-2.0
 python-keystoneclient>=3.8.0 # Apache-2.0
 mysqlclient>=1.4.0
+psutil>=3.2.2 # BSD