diff --git a/.github/workflows/testing.yml b/.github/workflows/testing.yml
index 318ae2b9..a1177a35 100644
--- a/.github/workflows/testing.yml
+++ b/.github/workflows/testing.yml
@@ -39,14 +39,8 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        python-version: [ "3.6", "3.7", "3.8", "3.9", "3.10" ]
-        django-version: [ "2.2", "3.0", "3.1", "3.2", "4.0" ]
-        exclude:
-          # Django v4 drops Python 3.6/3.7 support
-          - django-version: 4.0
-            python-version: 3.7
-          - django-version: 4.0
-            python-version: 3.6
+        python-version: [ "3.6", "3.7", "3.8" , "3.9", "3.10" ]
+        django-version: [ "2.2", "3.0", "3.1", "3.2" ]
     steps:
       - uses: actions/checkout@v2
       - uses: actions/setup-python@v2
@@ -56,7 +50,7 @@ jobs:
         id: poetry-cache
         with:
           path: ~/.local
-          key: key-0
+          key: key-1
       - name: Install poetry
         uses: snok/install-poetry@v1
         with:
@@ -66,7 +60,7 @@ jobs:
         id: cache-venv
         with:
           path: .venv
-          key: ${{ hashFiles('**/poetry.lock') }}-0
+          key: ${{ matrix.python-version }}-${{ hashFiles('**/poetry.lock') }}-1
       - run: |
           pip install virtualenv
           virtualenv .venv
@@ -74,14 +68,16 @@ jobs:
           pip install pip setuptools wheel -U
           poetry install --no-interaction --no-root
         if: steps.cache-venv.outputs.cache-hit != 'true'
-      - run: |
+      - name: Install django version
+        run: |
           source .venv/bin/activate
           pip install "Django==${{ matrix.django-version }}"
+      - run: |
+          source .venv/bin/activate
+          pip install coverage[toml]
       - name: Install DRF 3.11 on Django 2.2
         if: matrix.django-version == '2.2'
         run: pip install "djangorestframework==3.11.1"
-      - run: pip install coverage
-        if: matrix.python-version == '3.10'
       - name: Run tests
         run: |
           source .venv/bin/activate
diff --git a/poetry.lock b/poetry.lock
index 08e54d9d..3d515f2d 100644
--- a/poetry.lock
+++ b/poetry.lock
@@ -595,15 +595,16 @@ testing = ["argcomplete", "hypothesis (>=3.56)", "mock", "nose", "requests", "xm
 
 [[package]]
 name = "pytest-cov"
-version = "3.0.0"
+version = "2.12.1"
 description = "Pytest plugin for measuring coverage."
 category = "dev"
 optional = false
-python-versions = ">=3.6"
+python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*"
 
 [package.dependencies]
-coverage = {version = ">=5.2.1", extras = ["toml"]}
+coverage = ">=5.2.1"
 pytest = ">=4.6"
+toml = "*"
 
 [package.extras]
 testing = ["fields", "hunter", "process-tests", "six", "pytest-xdist", "virtualenv"]
@@ -733,11 +734,11 @@ python-versions = ">=2.6, !=3.0.*, !=3.1.*, !=3.2.*"
 
 [[package]]
 name = "tomli"
-version = "2.0.0"
+version = "1.2.3"
 description = "A lil' TOML parser"
 category = "dev"
 optional = false
-python-versions = ">=3.7"
+python-versions = ">=3.6"
 
 [[package]]
 name = "typed-ast"
@@ -820,7 +821,7 @@ testing = ["pytest (>=4.6)", "pytest-checkdocs (>=2.4)", "pytest-flake8", "pytes
 [metadata]
 lock-version = "1.1"
 python-versions = ">=3.6.1,<4.0.0"
-content-hash = "68e0aee3f72602a716897c05bf47d966ddd398a37683e2161ccbedc0779359b1"
+content-hash = "5c32e31364487abee8d2d7e5e0cda2ea7c0c7b8864959b15fd484994ee84c51c"
 
 [metadata.files]
 asgiref = [
@@ -1180,8 +1181,8 @@ pytest = [
     {file = "pytest-6.2.5.tar.gz", hash = "sha256:131b36680866a76e6781d13f101efb86cf674ebb9762eb70d3082b6f29889e89"},
 ]
 pytest-cov = [
-    {file = "pytest-cov-3.0.0.tar.gz", hash = "sha256:e7f0f5b1617d2210a2cabc266dfe2f4c75a8d32fb89eafb7ad9d06f6d076d470"},
-    {file = "pytest_cov-3.0.0-py3-none-any.whl", hash = "sha256:578d5d15ac4a25e5f961c938b85a05b09fdaae9deef3bb6de9a6e766622ca7a6"},
+    {file = "pytest-cov-2.12.1.tar.gz", hash = "sha256:261ceeb8c227b726249b376b8526b600f38667ee314f910353fa318caa01f4d7"},
+    {file = "pytest_cov-2.12.1-py2.py3-none-any.whl", hash = "sha256:261bb9e47e65bd099c89c3edf92972865210c36813f80ede5277dceb77a4a62a"},
 ]
 pytest-django = [
     {file = "pytest-django-4.5.2.tar.gz", hash = "sha256:d9076f759bb7c36939dbdd5ae6633c18edfc2902d1a69fdbefd2426b970ce6c2"},
@@ -1286,8 +1287,8 @@ toml = [
     {file = "toml-0.10.2.tar.gz", hash = "sha256:b3bda1d108d5dd99f4a20d24d9c348e91c4db7ab1b749200bded2f839ccbe68f"},
 ]
 tomli = [
-    {file = "tomli-2.0.0-py3-none-any.whl", hash = "sha256:b5bde28da1fed24b9bd1d4d2b8cba62300bfb4ec9a6187a957e8ddb9434c5224"},
-    {file = "tomli-2.0.0.tar.gz", hash = "sha256:c292c34f58502a1eb2bbb9f5bbc9a5ebc37bee10ffb8c2d6bbdfa8eb13cc14e1"},
+    {file = "tomli-1.2.3-py3-none-any.whl", hash = "sha256:e3069e4be3ead9668e21cb9b074cd948f7b3113fd9c8bba083f48247aab8b11c"},
+    {file = "tomli-1.2.3.tar.gz", hash = "sha256:05b6166bff487dc068d322585c7ea4ef78deed501cc124060e0f238e89a9231f"},
 ]
 typed-ast = [
     {file = "typed_ast-1.5.1-cp310-cp310-macosx_10_9_x86_64.whl", hash = "sha256:5d8314c92414ce7481eee7ad42b353943679cf6f30237b5ecbf7d835519e1212"},
diff --git a/pyproject.toml b/pyproject.toml
index b58ba058..958f03ef 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -41,12 +41,12 @@ packages = [
 ]
 
 [tool.poetry.dependencies]
+python = ">=3.6.1,<4.0.0"
 djangorestframework = "*"
-django = "^2.2 || ^3.0 || ^4.0"
+django = "^2.2 || ^3.0"
 inflection = "*"
 openapi-spec-validator = "*"
 prance = "*"
-python = ">=3.6.1,<4.0.0"
 pyYAML = "*"
 
 [tool.poetry.dev-dependencies]
@@ -55,10 +55,10 @@ drf-yasg = "*"
 Faker = "*"
 pre-commit = "*"
 pytest = "*"
-pytest-cov = "*"
 pytest-django = "*"
 pylint = "*"
-coverage = { extras = ["toml"], version = "^6.1.1", python = "3.10" }
+coverage = { extras = ["toml"], version = "^6"}
+pytest-cov = "^2"
 
 [tool.black]
 line-length = 120
diff --git a/test_project/settings.py b/test_project/settings.py
index 4385023e..587a2390 100644
--- a/test_project/settings.py
+++ b/test_project/settings.py
@@ -75,7 +75,6 @@
 LANGUAGE_CODE = "en"
 TIME_ZONE = "UTC"
 USE_I18N = True
-USE_L10N = True
 USE_TZ = True
 STATIC_URL = "/test_project/static/"
 STATIC_ROOT = os.path.join(BASE_DIR, "static")