diff --git a/requirements.txt b/requirements.txt
index e863bce..d15c19f 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,23 +1,26 @@
-pbr>=1.6
+# The order of packages is significant, because pip processes them in the order
+# 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
 aniso8601==1.2.0
 click==6.6
-Flask==0.11.1
+Flask!=0.11,<1.0,>=0.10 # BSD
 Flask-Cors==3.0.2
-Flask-RESTful==0.3.5
+Flask-RESTful>=0.3.5 # BSD
 itsdangerous==0.24
-jsonschema>=2.0.0,<3.0.0,!=2.5.0  # MIT
-Jinja2==2.8
+jsonschema<3.0.0,>=2.6.0 # MIT
+Jinja2!=2.9.0,!=2.9.1,!=2.9.2,!=2.9.3,!=2.9.4,>=2.8 # BSD License (3 clause)
 MarkupSafe==0.23
-python-dateutil==2.5.3
-pytz==2016.7
-requests==2.11.1
-six==1.10.0
-gunicorn==19.6.0
+python-dateutil>=2.4.2 # BSD
+pytz>=2013.6 # MIT
+requests>=2.14.2 # Apache-2.0
+six>=1.10.0 # MIT
+gunicorn>=19.0.0 # MIT
 python-etcd>=0.4.3 # MIT License
-oslo.utils>=3.20.0 # Apache-2.0
-oslo.config>=3.22.0 # Apache-2.0
-oslo.i18n>=2.1.0 # Apache-2.0
-python-ironicclient>=1.11.0  # Apache-2.0
+oslo.utils>=3.33.0 # Apache-2.0
+oslo.config>=5.1.0 # Apache-2.0
+oslo.i18n>=3.15.3 # Apache-2.0
+python-ironicclient>=2.2.0 # Apache-2.0
 python-keystoneclient>=3.8.0 # Apache-2.0
 stevedore>=1.20.0 # Apache-2.0
 sushy>=0.1.0 # Apache-2.0
diff --git a/setup.py b/setup.py
index 056c16c..566d844 100644
--- a/setup.py
+++ b/setup.py
@@ -25,5 +25,5 @@ except ImportError:
     pass
 
 setuptools.setup(
-    setup_requires=['pbr'],
+    setup_requires=['pbr>=2.0.0'],
     pbr=True)
diff --git a/test-requirements.txt b/test-requirements.txt
index cec9c78..80b0d1a 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
 
-coverage>=3.6
+coverage!=4.4,>=4.0 # Apache-2.0
 flake8-import-order==0.11 # LGPLv3
-freezegun>=0.3.6  # Apache-2.0
-python-subunit>=0.0.18
-sphinx!=1.2.0,!=1.3b1,<1.3,>=1.1.2
-oslosphinx>=2.5.0 # Apache-2.0
-oslotest>=1.10.0 # Apache-2.0
-testrepository>=0.0.18
-testscenarios>=0.4
-testtools>=1.4.0
+freezegun>=0.3.6 # Apache-2.0
+python-subunit>=1.0.0 # Apache-2.0/BSD
+sphinx!=1.6.6,>=1.6.2 # BSD
+oslosphinx>=4.7.0 # Apache-2.0
+oslotest>=3.2.0 # Apache-2.0
+testrepository>=0.0.18 # Apache-2.0/BSD
+testscenarios>=0.4 # Apache-2.0/BSD
+testtools>=2.2.0 # MIT
 
 # releasenotes
-reno>=1.6.2 # Apache2
+reno>=2.5.0 # Apache-2.0
 
 #api-ref
-openstackdocstheme>=1.5.0 # Apache-2.0
+openstackdocstheme>=1.18.1 # Apache-2.0
 os-api-ref>=1.4.0 # Apache-2.0