diff --git a/requirements.txt b/requirements.txt
index d9c89bf..2ba3e1a 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -5,5 +5,6 @@
 dnspython>=1.16.0  # http://www.dnspython.org/LICENSE
 ddt>=1.0.1 # MIT
 oslo.serialization>=2.25.0 # Apache-2.0
+oslo.utils>=3.33.0 # Apache-2.0
 testtools>=2.2.0 # MIT
 tempest>=17.1.0 # Apache-2.0