diff --git a/lower-constraints.txt b/lower-constraints.txt
index 1a6f15570f..27d726439e 100644
--- a/lower-constraints.txt
+++ b/lower-constraints.txt
@@ -95,6 +95,7 @@ python-cinderclient==3.3.0
 python-dateutil==2.5.3
 python-glanceclient==2.8.0
 python-keystoneclient==3.15.0
+python-memcached==1.59
 python-mimeparse==1.6.0
 python-neutronclient==6.7.0
 python-novaclient==9.1.0
diff --git a/test-requirements.txt b/test-requirements.txt
index 098d1d3953..3e33d214da 100644
--- a/test-requirements.txt
+++ b/test-requirements.txt
@@ -17,6 +17,7 @@ flake8-import-order==0.12 # LGPLv3
 mock>=2.0.0 # BSD
 mox3>=0.20.0 # Apache-2.0
 nodeenv>=0.9.4 # BSD
+python-memcached>=1.59 # PSF
 pylint==2.2.2;python_version>='3.0' # GPLv2
 selenium>=2.50.1 # Apache-2.0
 testscenarios>=0.4 # Apache-2.0/BSD