diff --git a/lower-constraints.txt b/lower-constraints.txt
index 59fc4f2b3..06066ac88 100644
--- a/lower-constraints.txt
+++ b/lower-constraints.txt
@@ -21,6 +21,7 @@ python-neutronclient==7.2.1
 python-novaclient==17.2.1
 python-octaviaclient==2.2.0
 python-openstackclient==5.4.0
+PyYAML==5.4.1
 six==1.15.0
 sshtunnel==0.3.1
 stestr==3.1.0
diff --git a/requirements.txt b/requirements.txt
index ce02ef648..c117ab8ed 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -19,6 +19,7 @@ python-neutronclient>=7.2.1     # Apache-2.0
 python-novaclient>=17.2.1       # Apache-2.0
 python-octaviaclient>=2.2.0     # Apache-2.0
 python-openstackclient>=5.4.0   # Apache-2.0
+PyYAML>=5.4.1                   # MIT
 six>=1.15.0                     # MIT
 sshtunnel>=0.3.1                # MIT
 testtools>=2.4.0                # MIT