diff --git a/.flake8 b/.flake8
index 063a6da..c31f9e8 100644
--- a/.flake8
+++ b/.flake8
@@ -4,6 +4,10 @@ max-complexity = 10
 ignore =
     E126,
     E501,
+    E741,
+    E722,
     F401,
     F811,
-    C901
+    C901,
+    W503,
+    W504
diff --git a/.travis.yml b/.travis.yml
index 3ea7580..c0b9447 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,9 +1,9 @@
 sudo: false
 language: python
 python:
-- '2.7'
-- '3.5'
 - '3.6'
+- '3.7'
+- '3.8'
 install: pip install tox-travis
 script: tox
 deploy:
diff --git a/requirements.txt b/requirements.txt
index 30f6d1d..247ba6a 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,13 +1,12 @@
-argcomplete==1.8.2
-colorama==0.3.9
-flake8==3.2.1
-jmespath==0.9.2
-mock==2.0.0
-pylint==1.9.4; python_version <= '2.7'
-pylint==2.3.1; python_version >= '3.5'
-pygments==2.2.0
-pyyaml==3.12
-six==1.10.0
-tabulate==0.7.7
-vcrpy==1.10.3
-pytest==4.6.6
+argcomplete==1.11.1
+colorama==0.4.3
+flake8==3.7.9
+jmespath==0.9.4
+mock==4.0.1
+pylint==2.3.0
+Pygments==2.5.2
+PyYAML==5.3
+six==1.14.0
+tabulate==0.8.6
+vcrpy==4.0.2
+pytest==5.3.5
diff --git a/setup.py b/setup.py
index 5f1c1ab..6c18bc4 100644
--- a/setup.py
+++ b/setup.py
@@ -39,12 +39,11 @@
         'Intended Audience :: Developers',
         'Intended Audience :: System Administrators',
         'Programming Language :: Python',
-        'Programming Language :: Python :: 2',
-        'Programming Language :: Python :: 2.7',
         'Programming Language :: Python :: 3',
         'Programming Language :: Python :: 3.5',
         'Programming Language :: Python :: 3.6',
         'Programming Language :: Python :: 3.7',
+        'Programming Language :: Python :: 3.8',
         'License :: OSI Approved :: MIT License',
     ],
     packages=['knack', 'knack.testsdk'],
diff --git a/tests/test_config.py b/tests/test_config.py
index aa49dd3..bf71f48 100644
--- a/tests/test_config.py
+++ b/tests/test_config.py
@@ -186,13 +186,15 @@ def test_set_config_value_file_permissions(self):
         file_mode = os.stat(self.cli_config.config_path).st_mode
         self.assertTrue(bool(file_mode & stat.S_IRUSR))
         self.assertTrue(bool(file_mode & stat.S_IWUSR))
-        self.assertFalse(bool(file_mode & stat.S_IXUSR))
-        self.assertFalse(bool(file_mode & stat.S_IRGRP))
-        self.assertFalse(bool(file_mode & stat.S_IWGRP))
-        self.assertFalse(bool(file_mode & stat.S_IXGRP))
-        self.assertFalse(bool(file_mode & stat.S_IROTH))
-        self.assertFalse(bool(file_mode & stat.S_IWOTH))
-        self.assertFalse(bool(file_mode & stat.S_IXOTH))
+        # only S_IRUSR and S_IWUSR are supported on Windows: https://docs.python.org/3.8/library/os.html#os.chmod
+        if os.name != 'nt':
+            self.assertFalse(bool(file_mode & stat.S_IXUSR))
+            self.assertFalse(bool(file_mode & stat.S_IRGRP))
+            self.assertFalse(bool(file_mode & stat.S_IWGRP))
+            self.assertFalse(bool(file_mode & stat.S_IXGRP))
+            self.assertFalse(bool(file_mode & stat.S_IROTH))
+            self.assertFalse(bool(file_mode & stat.S_IWOTH))
+            self.assertFalse(bool(file_mode & stat.S_IXOTH))
 
     def test_has_option_local(self):
         section = 'MySection'
diff --git a/tox.ini b/tox.ini
index dad6730..95c8a67 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,5 +1,5 @@
 [tox]
-envlist = py27,py35,py36,py37
+envlist = py36,py37,py38
 [testenv]
 deps = -rrequirements.txt
 commands=