diff --git a/.github/workflows/build_test.yml b/.github/workflows/build_test.yml
index d5364e6..aac0944 100644
--- a/.github/workflows/build_test.yml
+++ b/.github/workflows/build_test.yml
@@ -14,7 +14,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python-version: ['3.6', '3.10']
+        python-version: ['3.7', '3.10']
     steps:
     - uses: actions/checkout@v2
     - name: Set up Python ${{ matrix.python-version }}
diff --git a/.github/workflows/unit_test.yml b/.github/workflows/unit_test.yml
index a076b00..8fd5b95 100644
--- a/.github/workflows/unit_test.yml
+++ b/.github/workflows/unit_test.yml
@@ -15,7 +15,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python-version: ['3.9']
+        python-version: ['3.10']
     steps:
     - uses: actions/checkout@v2
     - name: Set up Python ${{ matrix.python-version }}
@@ -25,14 +25,14 @@ jobs:
     - name: Install dependencies
       run: |
         python -m pip install --upgrade pip
-        if [ -f requirements.txt ]; then pip install -r requirements.txt; fi
-        if [ -f requirements-dev.txt ]; then pip install -r requirements-dev.txt; fi
+        pip install '.[dev]'
     - name: Lint with flake8
       run: |
         # stop the build if there are Python syntax errors or undefined names
-        flake8 waybackpy/ --count --select=E9,F63,F7,F82 --show-source --statistics
-        # exit-zero treats all errors as warnings. The GitHub editor is 127 chars wide
-        # flake8 waybackpy/ --count --exit-zero --max-complexity=10 --max-line-length=127 --statistics --per-file-ignores="waybackpy/__init__.py:F401"
+        flake8 . --count --show-source --statistics
+    - name: Lint with black
+      run: |
+        black . --check --diff
     # - name: Static type test with mypy
     #   run: |
     #     mypy
diff --git a/setup.cfg b/setup.cfg
index a4279c4..197b071 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -30,9 +30,6 @@ classifiers =
     License :: OSI Approved :: MIT License
     Programming Language :: Python
     Programming Language :: Python :: 3
-    Programming Language :: Python :: 3.4
-    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
@@ -41,7 +38,7 @@ classifiers =
 
 [options]
 packages = find:
-python_requires = >= 3.4
+python_requires = >= 3.7
 install_requires =
     click
     requests