fix: Use the older version of urllib3

.github/workflows/integration-tests.yml

@@ -11,17 +11,23 @@ jobs:
   tests:
     name: Integration tests
     runs-on: ubuntu-20.04
+    strategy:
+      max-parallel: 1
+      matrix:
+        python-version:
+        - '3.6'
+        - '3.8'
     steps:
       - name: Checkout
         uses: actions/checkout@v2
-      - name: Set up Python 3.6
+      - name: Set up Python ${{ matrix.python-version }}
         uses: actions/setup-python@v2
         with:
-          python-version: '3.6'
+          python-version: ${{ matrix.python-version }}
       - name: Install dependencies
         run: |
           python -m pip install --upgrade pip
-          python -m pip install tox
+          python -m pip install -e ".[dev]"
       - name: Run integration tests
         run: |
           tox -e integration-tests

setup.py

@@ -53,14 +53,15 @@ def main():
     base_dir = dirname(__file__)
     install_requires = [
         'attrs>=17.3.0',
-        'requests>=2.4.3',
+        'urllib3<2',
+        'requests>=2.4.3,<3',
         'requests-toolbelt>=0.4.0',
         'python-dateutil',  # To be removed after dropping Python 3.6
     ]
     redis_requires = ['redis>=2.10.3']
     jwt_requires = ['pyjwt>=1.7.0', 'cryptography>=3']
     coveralls_requires = ['coveralls']
-    dev_requires = ['tox']
+    dev_requires = ['tox<=3.28.0']
     gh_requires = ['tox-gh-actions']
     test_requires = [
         'bottle',