diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 741d3f8..dda73f3 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -1,4 +1,4 @@
-name: Link Status
+name: Tests
 
 on: [push, pull_request]
 
@@ -6,6 +6,7 @@ jobs:
   pre-commit:
     name: Pre-Commit Checks
     runs-on: ubuntu-latest
+
     steps:
       - name: Checkout to master
         uses: actions/checkout@master
@@ -13,26 +14,46 @@ jobs:
       - name: Setup python
         uses: actions/setup-python@v1
         with:
-          python-version: '3.7'
+          python-version: '3.8'
           architecture: 'x64'
 
       - name: Pre-Commit Checks
         run: |
-            python -m pip install pre-commit
-            pre-commit run -a
+          python -m pip install pip --upgrade
+          pip install nox
+          nox -s pre_commit
 
       - name: Analysis (git diff)
         if: failure()
         run: git diff
 
-  tests:
-    name: Test-${{ matrix.os }}-Py${{ matrix.python-version }}
+  package:
+    name: Build & Verify Package
     needs: pre-commit
-    runs-on: ${{ matrix.os }}
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout to master
+        uses: actions/checkout@master
+
+      - name: Setup python
+        uses: actions/setup-python@v1
+        with:
+          python-version: '3.8'
+          architecture: 'x64'
+      - name: Build and check with twine
+        run: |
+          python -m pip install pip --upgrade
+          pip install nox
+          nox -s package
+
+  unit-tests:
+    name: UnitTests-Python-${{ matrix.python-version }}
+    needs: [ pre-commit, package ]
+    runs-on: ubuntu-latest
     strategy:
       matrix:
-        os: [ubuntu-latest, windows-latest, macos-latest]
-        python-version: [ '3.6', '3.7' ]
+        python-version: [ 'pypy3', '3.6', '3.7', '3.8' ]
     steps:
       - name: Checkout to master
         uses: actions/checkout@master
@@ -43,10 +64,39 @@ jobs:
           python-version: ${{ matrix.python-version }}
           architecture: x64
 
-      - name: Setup Package and Install Devel Dependencies
+      - name: Unit Tests
         run: |
-          python -m pip install -Ur dev-requirements.txt
-          python -m pip install .
+          python -m pip install pip --upgrade
+          pip install nox
+          nox -s ci_tests
 
-      - name: Unit Tests
-        run: py.test -v tests
+      - name: Upload coverage to Codecov
+        uses: codecov/codecov-action@v1.0.6
+        with:
+          file: coverage.xml
+          flags: unittests
+          name: codecov-linkstatus-{{ matrix.python-version }}
+          fail_ci_if_error: true
+
+  platform:
+    name: Platform-${{ matrix.os }}
+    needs: [ unit-tests]
+    runs-on: ${{ matrix.os }}
+    strategy:
+      matrix:
+        os: [ubuntu-latest, windows-latest, macos-latest]
+    steps:
+      - name: Checkout to master
+        uses: actions/checkout@master
+
+      - name: Setup python
+        uses: actions/setup-python@v1
+        with:
+          python-version: '3.8'
+          architecture: 'x64'
+
+      - name: Development setup and smoke test on platform ${{ matrix.os }}
+        run: |
+          python -m pip install pip --upgrade
+          pip install nox
+          nox -s dev_setup
diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index eb8b137..bb5246f 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -10,7 +10,8 @@ on:
 jobs:
   build-and-publish:
     name: Build and publish Python 🐍 distributions to PyPI
-    runs-on: ubuntu-18.04
+    if: startsWith(github.event.ref, 'refs/tags')
+    runs-on: ubuntu-latest
     steps:
       - name: Checkout to master
         uses: actions/checkout@master
@@ -18,16 +19,16 @@ jobs:
       - name: Setup python
         uses: actions/setup-python@v1
         with:
-          python-version: '3.7'
+          python-version: '3.8'
           architecture: 'x64'
 
-      - name: Build Package
+      - name: Build Package and Check
         run: |
-          python -m pip install --upgrade setuptools wheel
+          python -m pip install --upgrade setuptools wheel twine
           python setup.py sdist bdist_wheel
+          python -m twine check dist/*
 
       - name: Deploy to PyPi
-        if: startsWith(github.event.ref, 'refs/tags')
         uses: pypa/gh-action-pypi-publish@master
         with:
           user: __token__
diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index f4b90b9..27e9a98 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -54,15 +54,15 @@ Below is the steps for setting up a development environment
 ```shell
 git clone https://github.com/pythonpune/linkstatus
 cd linkstatus
-virtualenv .venv
+python -m venv .venv
 source .venv/bin/activate
-python -m pip install -Ur dev-requirements.txt
 python -m pip install -e .
 linkstatus --help
 ```
 
 # Run unit test with nox
 ```shell
+python -m pip install nox
 nox --list          # list all available sessions
 nox -s pre_commit   # run pre-commit checks
 nox -s tests        # run unit tests
diff --git a/README.md b/README.md
index 0ff23f6..ea6b212 100644
--- a/README.md
+++ b/README.md
@@ -3,11 +3,10 @@
 
 <p align="center">
     <a href="https://pypi.org/project/linkstatus"><img alt="Python Versions" src="https://img.shields.io/pypi/pyversions/linkstatus.svg?style=flat"></a>
-    <a href="https://travis-ci.com/pythonpune/linkstatus"><img alt="Build Status"
-    src="https://travis-ci.com/pythonpune/linkstatus.svg?branch=master"></a>
-    <a href="https://github.com/pythonpune/linkstatus/blob/master/LICENSE"><img alt="License: GPLv3" src="https://img.shields.io/pypi/l/linkstatus.svg?version=latest"></a>
     <a href="https://pypi.org/project/linkstatus/#history"><img alt="PyPI version" src="https://badge.fury.io/py/linkstatus.svg"></a>
     <a href="https://pepy.tech/project/linkstatus"><img alt="Downloads" src="https://pepy.tech/badge/linkstatus"></a>
+    <a href="https://codecov.io/gh/pythonpune/linkstatus"><img src="https://codecov.io/gh/pythonpune/linkstatus/branch/master/graph/badge.svg"></a>
+    <a href="https://github.com/pythonpune/linkstatus/blob/master/LICENSE"><img alt="License: GPLv3" src="https://img.shields.io/pypi/l/linkstatus.svg?version=latest"></a>
     <a href="https://pypi.org/project/black"><img alt="Code style: black" src="https://img.shields.io/badge/code%20style-black-000000.svg"></a>
 </p>
 
diff --git a/dev-requirements.txt b/dev-requirements.txt
deleted file mode 100644
index 3678590..0000000
--- a/dev-requirements.txt
+++ /dev/null
@@ -1,4 +0,0 @@
-nox
-pre-commit
-pytest
-ruamel.yaml
diff --git a/noxfile.py b/noxfile.py
index 9728113..a3ea44a 100644
--- a/noxfile.py
+++ b/noxfile.py
@@ -1,13 +1,60 @@
 import nox
 
+nox.options.sessions = ["pre_commit", "tests"]
+
 
 @nox.session
 def pre_commit(session):
+    """pre-commit checks"""
     session.install("pre-commit")
     session.run("pre-commit", "run", "-a")
 
 
-@nox.session(python=["3.6", "3.7"])
+@nox.session(python=["pypy3", "3.6", "3.7", "3.8"])
 def tests(session):
-    session.install("pytest", "ruamel.yaml", ".")
-    session.run("pytest", "-sqvv", "tests")
+    """Run unit test over different python env with code coverage"""
+    session.install("pytest", "pytest-cov", "ruamel.yaml", "-e", ".")
+    session.run(
+        "py.test",
+        "--cov=linkstatus",
+        "--cov-report",
+        "term-missing",
+        "--cov-branch",
+        "--color=yes",
+        "-s",
+        "-v",
+    )
+
+
+@nox.session()
+def ci_tests(session):
+    """This is only to run test on ci"""
+    session.install("pytest", "pytest-cov", "coverage", "ruamel.yaml", "-e", ".")
+    session.run(
+        "py.test",
+        "--cov=linkstatus",
+        "--cov-report=xml",
+        "--cov-branch",
+        "--color=yes",
+        "-s",
+        "-v",
+    )
+    session.run("coverage", "report")
+
+
+@nox.session()
+def package(session):
+    """Build and verify package"""
+    session.install("twine", "setuptools", "wheel")
+    session.run("python", "setup.py", "sdist", "bdist_wheel")
+    session.run("ls", "-l", "dist")
+    session.run("python", "-m", "twine", "check", "dist/*")
+
+
+@nox.session()
+def dev_setup(session):
+    """Ensure development environment works everywhere. mainly with ci on different platform"""
+    session.run("python", "-m", "pip", "install", "-e", ".[dev]")
+    session.run("python", "-c", "import linkstatus; print(linkstatus.__spec__)")
+    session.install("pytest", "ruamel.yaml")
+    session.run("py.test", "-v", "tests/test_linkstatus.py")
diff --git a/setup.cfg b/setup.cfg
index 3b2c993..a615a41 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -21,12 +21,13 @@ long_description = file: README.md
 long_description_content_type = text/markdown
 classifiers =
     Natural Language :: English
-    Programming Language :: Python :: 3.5
     Programming Language :: Python :: 3.6
     Programming Language :: Python :: 3.7
+    Programming Language :: Python :: 3.8
     Intended Audience :: End Users/Desktop
     Intended Audience :: Developers
     Environment :: Console
+    License :: OSI Approved :: GNU General Public License v3 (GPLv3)
 
 [options]
 packages = find:
@@ -37,7 +38,7 @@ install_requires =
     markdown
     requests
 include_package_data = True
-python_requires = >=3.5
+python_requires = >=3.6
 
 [options.entry_points]
 console_scripts =