diff --git a/lower-constraints.txt b/lower-constraints.txt
index ada181fc..c272ada5 100644
--- a/lower-constraints.txt
+++ b/lower-constraints.txt
@@ -60,6 +60,7 @@ snowballstemmer==1.2.1
 Sphinx==1.6.5
 sphinxcontrib-websupport==1.0.1
 stevedore==1.28.0
+systemd-python==234
 testrepository==0.0.20
 testtools==2.3.0
 traceback2==1.4.0
diff --git a/requirements.txt b/requirements.txt
index 44484910..303bce23 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -2,14 +2,14 @@
 # of appearance. Changing the order has an impact on the overall integration
 # process, which may cause wedges in the gate later.
 
-pbr!=2.1.0,>=2.0.0 # Apache-2.0
-six>=1.10.0 # MIT
+pbr>=3.1.1 # Apache-2.0
+six>=1.11.0 # MIT
 oslo.config>=5.2.0 # Apache-2.0
-oslo.context>=2.19.2 # Apache-2.0
-oslo.i18n>=3.15.3 # Apache-2.0
-oslo.utils>=3.33.0 # Apache-2.0
-oslo.serialization!=2.19.1,>=2.18.0 # Apache-2.0
-debtcollector>=1.2.0 # Apache-2.0
+oslo.context>=2.20.0 # Apache-2.0
+oslo.i18n>=3.20.0 # Apache-2.0
+oslo.utils>=3.36.0 # Apache-2.0
+oslo.serialization>=2.25.0 # Apache-2.0
+debtcollector>=1.19.0 # Apache-2.0
 pyinotify>=0.9.6;sys_platform!='win32' and sys_platform!='darwin' and sys_platform!='sunos5' # MIT
-python-dateutil>=2.5.3 # BSD
-monotonic>=0.6 # Apache-2.0
+python-dateutil>=2.7.0 # BSD
+monotonic>=1.4 # Apache-2.0
diff --git a/test-requirements.txt b/test-requirements.txt
index 797f106d..cc44b3b7 100644
--- a/test-requirements.txt
+++ b/test-requirements.txt
@@ -4,20 +4,20 @@
 
 hacking!=0.13.0,<0.14,>=0.12.0 # Apache-2.0
 
-testrepository>=0.0.18 # Apache-2.0/BSD
-testtools>=2.2.0 # MIT
+testrepository>=0.0.20 # Apache-2.0/BSD
+testtools>=2.3.0 # MIT
 mock>=2.0.0 # BSD
-oslotest>=3.2.0 # Apache-2.0
+oslotest>=3.3.0 # Apache-2.0
 
 # when we can require tox>= 1.4, this can go into tox.ini:
 #  [testenv:cover]
 #  deps = {[testenv]deps} coverage
-coverage!=4.4,>=4.0 # Apache-2.0
+coverage>=4.5.1 # Apache-2.0
 
 # this is required for the docs build jobs
-sphinx!=1.6.6,!=1.6.7,>=1.6.2 # BSD
-openstackdocstheme>=1.18.1 # Apache-2.0
-reno>=2.5.0 # Apache-2.0
+sphinx!=1.6.6,!=1.6.7,>=1.6.5 # BSD
+openstackdocstheme>=1.20.0 # Apache-2.0
+reno>=2.7.0 # Apache-2.0
 
 # Bandit security code scanner
 bandit>=1.1.0 # Apache-2.0