diff --git a/proliantutils/hpssa/objects.py b/proliantutils/hpssa/objects.py
index b64b8508..51384c84 100644
--- a/proliantutils/hpssa/objects.py
+++ b/proliantutils/hpssa/objects.py
@@ -568,7 +568,7 @@ class LogicalDrive(object):
                 'volume_name': self.volume_name}
 
 
-class PhysicalDrive:
+class PhysicalDrive(object):
     """Class for PhysicalDrive object."""
 
     def __init__(self, id, properties, parent):
diff --git a/requirements.txt b/requirements.txt
index 365eb6f9..ad4221a0 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,3 +1,4 @@
+pbr>=2.0.0 # Apache-2.0
 six>=1.9.0
 oslo.concurrency>=1.8.0
 oslo.utils>=1.4.0
diff --git a/setup.py b/setup.py
index b96e3990..78985557 100644
--- a/setup.py
+++ b/setup.py
@@ -3,5 +3,5 @@
 import setuptools
 
 setuptools.setup(
-    setup_requires=['pbr'],
+    setup_requires=['pbr>=2.0.0'],
     pbr=True)
diff --git a/test-requirements.txt b/test-requirements.txt
index 8e77bdfd..7c748fe6 100644
--- a/test-requirements.txt
+++ b/test-requirements.txt
@@ -1,5 +1,5 @@
 mock
-hacking>=0.9.2,<0.10
+hacking!=0.13.0,<0.14,>=0.12.0 # Apache-2.0
 coverage>=3.6 # Apache-2.0
 testrepository>=0.0.18
 testtools>=1.4.0 # MIT