diff --git a/lower-constraints.txt b/lower-constraints.txt
new file mode 100644
index 0000000..eda7ea0
--- /dev/null
+++ b/lower-constraints.txt
@@ -0,0 +1,65 @@
+appdirs==1.4.3
+certifi==2018.1.18
+cffi==1.13.1
+chardet==3.0.4
+cliff==3.1.0
+cmd2==0.8.9
+debtcollector==2.1.0
+decorator==4.4.2
+dogpile.cache==0.9.2
+entrypoints==0.3
+etcd3gw==0.2.0
+extras==1.0.0
+fixtures==3.0.0
+future==0.18.2
+futurist==2.2.0
+gitdb2==2.0.3
+GitPython==2.1.8
+idna==2.6
+iso8601==0.1.12
+keystoneauth1==3.4.0
+linecache2==1.0.0
+mock==4.0.2
+mox3==0.25.0
+msgpack==1.0.0
+netaddr==0.7.19
+netifaces==0.10.9
+os-client-config==1.29.0
+oslo.config==6.9.0
+oslo.context==3.1.0
+oslo.i18n==5.0.0
+oslo.log==3.44.0
+oslo.serialization==3.2.0
+oslo.utils==3.41.0
+oslotest==3.2.0
+pbr==3.1.1
+pifpaf==0.10.0
+prettytable==0.7.2
+prometheus-client==0.6.0
+pycparser==2.18
+pyinotify==0.9.6
+pymongo==3.0.2
+pyparsing==2.2.0
+pyperclip==1.8.0
+python-dateutil==2.8.1
+python-memcached==1.56
+python-mimeparse==1.6.0
+python-subunit==1.2.0
+pytz==2020.1
+PyYAML==3.12
+requests==2.18.4
+requestsexceptions==1.4.0
+rfc3986==1.4.0
+six==1.11.0
+smmap2==2.0.3
+stestr==2.0.0
+stevedore==1.28.0
+testrepository==0.0.20
+testtools==2.3.0
+traceback2==1.4.0
+unittest2==1.1.0
+urllib3==1.22
+voluptuous==0.11.7
+wcwidth==0.2.4
+wrapt==1.12.1
+xattr==0.9.3
diff --git a/requirements.txt b/requirements.txt
index 7bad9bf..dbf2789 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -2,12 +2,12 @@
 # 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
+pbr!=2.1.0,>=3.1.1 # Apache-2.0
 
 # General
-oslo.utils==3.41.0
-oslo.log==3.44.0
-oslo.config==6.9.0
+oslo.utils>=3.41.0
+oslo.log>=3.44.0
+oslo.config>=6.9.0
 
 # Metrics Exporter
-prometheus-client==0.6.0
+prometheus-client>=0.6.0