diff --git a/.travis.yml b/.travis.yml
index 4f1f2b34..60d67198 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,12 +1,14 @@
 sudo: required
 services:
-- docker
+  - docker
 cache:
-- pip
+  - pip
 language: python
 python:
-- '2.7'
-- '3.5'
+  - '3.9'
+  - '3.8'
+  - '3.7'
+  - '3.6'
 env:
   global:
     - COVERALLS_PARALLEL=true
@@ -19,26 +21,21 @@ env:
     - TEST_SUITE=dynamic-functional OPENSHIFT_VERSION=latest
 script: tox
 install:
-- pip install tox-travis coveralls
+  - pip install tox-travis coveralls
 after_success:
-- coveralls
+  - coveralls
 jobs:
   include:
   - stage: lint
-    python: '2.7'
+    python: '3.9'
     install:
-    - pip install tox-travis
-    script: tox -e py27-lint
-    env:
-    - TEST_SUITE=lint OPENSHIFT_VERSION=latest
-  - python: '3.5'
-    install:
-    - pip install tox-travis
+      - pip install tox-travis
     script: tox -e py35-lint
     env:
-    - TEST_SUITE=lint OPENSHIFT_VERSION=latest
+      - TEST_SUITE=lint OPENSHIFT_VERSION=latest
   - stage: deploy
     script: skip
+    python: '3.9'
     deploy:
       provider: pypi
       user: openshift
@@ -49,15 +46,16 @@ jobs:
         repo: openshift/openshift-restclient-python
         condition: "$TRAVIS_TAG =~ ^v[0-9]+\\.[0-9]+\\.[0-9]+(([ab]|dev|rc)[0-9]+)?$"
   - stage: test-deploy
+    python: '3.9'
     script: python -c "import openshift ; print(openshift.__version__)"
     install:
       - pip install openshift
 stages:
-- lint
-- test
-- name: deploy
-  if: (tag is present) and (type = push)
-- name: test-deploy
-  if: (tag is present) and (type = push)
+  - lint
+  - test
+  - name: deploy
+    if: (tag is present) and (type = push)
+  - name: test-deploy
+    if: (tag is present) and (type = push)
 notifications:
   webhooks: https://coveralls.io/webhook
diff --git a/openshift/__init__.py b/openshift/__init__.py
index c40d6957..d232613a 100644
--- a/openshift/__init__.py
+++ b/openshift/__init__.py
@@ -14,5 +14,5 @@
 
 # Do not edit these constants. They will be updated automatically
 # by scripts/update-version.sh.
-__version__ = "0.10.0dev1"
-__k8s_client_version__ = "9.0.0"
+__version__ = "0.12.1"
+__k8s_client_version__ = "12.0"
diff --git a/openshift/dynamic/client.py b/openshift/dynamic/client.py
index 000af480..3b80b972 100644
--- a/openshift/dynamic/client.py
+++ b/openshift/dynamic/client.py
@@ -216,12 +216,14 @@ def request(self, method, path, body=None, **params):
         header_params = params.get('header_params', {})
         form_params = []
         local_var_files = {}
-        # HTTP header `Accept`
-        header_params['Accept'] = self.client.select_header_accept([
-            'application/json',
-            'application/yaml',
-            'application/vnd.kubernetes.protobuf'
-        ])
+
+        # Checking Accept header.
+        new_header_params = dict((key.lower(), value) for key, value in header_params.items())
+        if not 'accept' in new_header_params:
+            header_params['Accept'] = self.client.select_header_accept([
+                'application/json',
+                'application/yaml',
+            ])
 
         # HTTP header `Content-Type`
         if params.get('content_type'):
diff --git a/python-openshift.spec b/python-openshift.spec
index 76f94435..e7e4800f 100644
--- a/python-openshift.spec
+++ b/python-openshift.spec
@@ -16,7 +16,7 @@
 %endif
 
 Name:       python-%{library}
-Version:    0.10.0dev1
+Version:    0.12.1
 Release:    1%{?dist}
 Summary:    Python client for the OpenShift API  
 License:    ASL 2.0
diff --git a/requirements.txt b/requirements.txt
index ab2e4c80..d7d0d34a 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,5 +1,5 @@
 jinja2
-kubernetes
+kubernetes >= 12.0
 python-string-utils
 ruamel.yaml
 six
diff --git a/scripts/constants.py b/scripts/constants.py
index 8c22e5e8..f08898c3 100644
--- a/scripts/constants.py
+++ b/scripts/constants.py
@@ -23,8 +23,8 @@
 
 # client version for packaging and releasing. It can
 # be different than SPEC_VERSION.
-CLIENT_VERSION = "0.10.0dev1"
-KUBERNETES_CLIENT_VERSION = "10.0.1"
+CLIENT_VERSION = "0.12.1"
+KUBERNETES_CLIENT_VERSION = "12.0"
 
 # Name of the release package
 PACKAGE_NAME = "openshift"
diff --git a/scripts/update-version.sh b/scripts/update-version.sh
index c6010dfa..d166dcf3 100755
--- a/scripts/update-version.sh
+++ b/scripts/update-version.sh
@@ -9,6 +9,6 @@ echo "--- updating version information..."
 sed -i'' "s/^CLIENT_VERSION = .*/CLIENT_VERSION = \\\"${CLIENT_VERSION}\\\"/" "${SCRIPT_ROOT}/../setup.py"
 sed -i'' "s/^__version__ = .*/__version__ = \\\"${CLIENT_VERSION}\\\"/" "${CLIENT_ROOT}/__init__.py"
 sed -i'' "s/^Version:.*/Version:    ${CLIENT_VERSION}/" "${SCRIPT_ROOT}/../python-openshift.spec"
-sed -i'' "s/^kubernetes ~= .*/kubernetes ~= ${KUBERNETES_CLIENT_VERSION}/" "${SCRIPT_ROOT}/../requirements.txt"
+sed -i'' "s/^kubernetes.*/kubernetes ~= ${KUBERNETES_CLIENT_VERSION}/" "${SCRIPT_ROOT}/../requirements.txt"
 sed -i'' "s/^__k8s_client_version__ = .*/__k8s_client_version__ = \\\"${KUBERNETES_CLIENT_VERSION}\\\"/" "${CLIENT_ROOT}/__init__.py"
 sed -i'' "s/^kubernetes .=.*/kubernetes ~= ${KUBERNETES_CLIENT_VERSION}/" ${SOURCE_ROOT}/requirements.txt
diff --git a/setup.py b/setup.py
index d2b794c1..2e5c2a55 100644
--- a/setup.py
+++ b/setup.py
@@ -24,7 +24,7 @@
 
 # Do not edit these constants. They will be updated automatically
 # by scripts/update-client.sh.
-CLIENT_VERSION = "0.10.0dev1"
+CLIENT_VERSION = "0.12.1"
 PACKAGE_NAME = "openshift"
 DEVELOPMENT_STATUS = "3 - Alpha"
 
@@ -61,10 +61,11 @@ def extract_requirements(filename):
         "License :: OSI Approved :: Apache Software License",
         "Operating System :: OS Independent",
         "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",
+        "Programming Language :: Python :: 3.9",
     ],
     entry_points={
         'console_scripts': ['openshift-ansible-gen = openshift.ansiblegen.cli:commandline']