diff --git a/README.rst b/README.rst
index 805b4735..a551505b 100644
--- a/README.rst
+++ b/README.rst
@@ -13,7 +13,7 @@ StorOps: The Python Library for VNX & Unity
 .. image:: https://landscape.io/github/emc-openstack/storops/master/landscape.svg?style=flat
     :target: https://landscape.io/github/emc-openstack/storops/
 
-VERSION: 0.4.4
+VERSION: 0.4.5
 
 A minimalist Python library to manage VNX/Unity systems.
 This document lies in the source code and go with the release.
diff --git a/requirements.os.txt b/requirements.os.txt
new file mode 100644
index 00000000..f0d14836
--- /dev/null
+++ b/requirements.os.txt
@@ -0,0 +1,8 @@
+## Please download these files with "--no-deps" option, e.g.
+##   pip download --no-deps -r <path to>/requirements.os.txt
+python-dateutil>=2.4.2 # BSD
+retryz>=0.1.8 # Apache-2.0
+cachez>=0.1.0 # Apache-2.0
+bitmath>=1.3.0 # MIT
+queuelib>=1.4.2 # BSD
+storops # Apache-2.0
diff --git a/requirements.txt b/requirements.txt
index 9b392a47..2872e5cf 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,10 +1,11 @@
-future>=0.15.1
-paramiko>=1.13.0
-python-dateutil>=2.4.2
-PyYAML>=3.11
-requests!=2.9.0,>=2.8.1
-retryz>=0.1.8
-cachez>=0.1.0
-six>=1.9.0
-bitmath>=1.3.0
-queuelib>=1.4.2
+paramiko>=1.13.0 # LGPLv2.1+, cinder, manila
+requests!=2.9.0,>=2.8.1 # Apache-2.0, cinder, manila
+PyYAML>=3.11 # MIT, cinder, manila
+six>=1.9.0 # MIT, cinder, manila
+enum34>=1.0.4;python_version=='2.7' or python_version=='2.6' or python_version=='3.3' # BSD, cinder
+
+python-dateutil>=2.4.2 # BSD
+retryz>=0.1.8 # Apache-2.0
+cachez>=0.1.0 # Apache-2.0
+bitmath>=1.3.0 # MIT
+queuelib>=1.4.2 # BSD
diff --git a/setup.py b/setup.py
index 6227c1d2..909a377c 100644
--- a/setup.py
+++ b/setup.py
@@ -19,7 +19,6 @@
 import io
 import os
 import re
-import sys
 
 from setuptools import setup, find_packages
 
@@ -54,14 +53,8 @@ def read_requirements(filename):
         return f.read().splitlines()
 
 
-def install_requirements(filename):
-    packages = read_requirements(filename)
-    if sys.version_info < (3, 4):
-        packages.append("enum34>=1.0.4")
-
-
 def get_description():
-    return "Python API for VNX and Unity."
+    return 'Python API for VNX and Unity.'
 
 
 def get_long_description():
@@ -70,29 +63,30 @@ def get_long_description():
 
 
 setup(
-    name="storops",
+    name='storops',
     version=version(),
-    author="Cedric Zhuang",
-    author_email="cedric.zhuang@gmail.com",
+    author='Cedric Zhuang',
+    author_email='cedric.zhuang@gmail.com',
+    url='https://github.com/emc-openstack/storops',
     description=get_description(),
-    license="Apache Software License",
-    keywords="VNX",
+    license='Apache Software License',
+    keywords='VNX Unity EMC Storage',
     include_package_data=True,
     packages=find_packages(),
     platforms=['any'],
     long_description=get_long_description(),
     classifiers=[
-        "Programming Language :: Python",
+        'Programming Language :: Python',
         'Programming Language :: Python :: 2.7',
         'Programming Language :: Python :: 3.4',
         'Programming Language :: Python :: 3.5',
         'Programming Language :: Python :: 3.6',
-        "Natural Language :: English",
-        "Intended Audience :: Developers",
-        "Operating System :: OS Independent",
-        "Development Status :: 4 - Beta",
-        "Topic :: Utilities",
-        "License :: OSI Approved :: Apache Software License",
+        'Natural Language :: English',
+        'Intended Audience :: Developers',
+        'Operating System :: OS Independent',
+        'Development Status :: 4 - Beta',
+        'Topic :: Utilities',
+        'License :: OSI Approved :: Apache Software License',
     ],
     install_requires=read_requirements('requirements.txt'),
     tests_require=read_requirements('test-requirements.txt')
diff --git a/storops/lib/converter.py b/storops/lib/converter.py
index e8537526..67212553 100644
--- a/storops/lib/converter.py
+++ b/storops/lib/converter.py
@@ -23,7 +23,6 @@
 
 import bitmath
 import dateutil.parser
-from past.builtins import filter
 import six
 
 from storops.vnx import enums
diff --git a/storops/unity/resource/filesystem.py b/storops/unity/resource/filesystem.py
index 431a811f..e33fa7aa 100644
--- a/storops/unity/resource/filesystem.py
+++ b/storops/unity/resource/filesystem.py
@@ -16,7 +16,6 @@
 from __future__ import unicode_literals
 
 import logging
-from past.builtins import filter
 from storops.exception import UnityResourceNotFoundError, \
     UnityCifsServiceNotEnabledError
 from storops.unity.enums import FSSupportedProtocolEnum, TieringPolicyEnum, \
@@ -135,8 +134,8 @@ def has_snap(self):
 
         :return: false if no snaps or all snaps are destroying.
         """
-        return len(filter(lambda s: s.state != SnapStateEnum.DESTROYING,
-                          self.snapshots)) > 0
+        return len(list(filter(lambda s: s.state != SnapStateEnum.DESTROYING,
+                               self.snapshots))) > 0
 
 
 class UnityFileSystemList(UnityResourceList):
diff --git a/storops/vnx/resource/vnx_domain.py b/storops/vnx/resource/vnx_domain.py
index 1265aef1..49be8c79 100644
--- a/storops/vnx/resource/vnx_domain.py
+++ b/storops/vnx/resource/vnx_domain.py
@@ -19,8 +19,6 @@
 import re
 from datetime import datetime
 
-from past.builtins import filter
-
 from storops.lib.common import clear_instance_cache
 from storops.lib.converter import to_datetime
 from storops.vnx.enums import VNXSPEnum
@@ -160,7 +158,7 @@ def filter_by_sp_name(member):
             sp = VNXSPEnum.parse(member.name)
             return sp == index
 
-        result = filter(filter_by_sp_name, self.list)
+        result = list(filter(filter_by_sp_name, self.list))
         ret = None
         if len(result) > 0:
             ret = result[0]