diff --git a/.github/workflows/conformance.yml b/.github/workflows/conformance.yml
index 0d86d788..4e066990 100644
--- a/.github/workflows/conformance.yml
+++ b/.github/workflows/conformance.yml
@@ -10,10 +10,16 @@ permissions: read-all
 
 jobs:
   build:
-    runs-on: ubuntu-latest
     strategy:
       matrix:
-        python: ['3.7', '3.8', '3.9', '3.10', '3.11', '3.12']
+        python: ['3.9', '3.10', '3.11', '3.12']
+        platform: [ubuntu-latest]
+        include:
+          - platform: ubuntu-22.04
+            python: '3.8'
+          - platform: ubuntu-22.04
+            python: '3.7'
+    runs-on: ${{ matrix.platform }}
     steps:
     - name: Harden Runner
       uses: step-security/harden-runner@91182cccc01eb5e619899d80e4e971d6181294a7 # v2.10.1
diff --git a/.github/workflows/unit.yml b/.github/workflows/unit.yml
index 463340a5..404b5159 100644
--- a/.github/workflows/unit.yml
+++ b/.github/workflows/unit.yml
@@ -1,5 +1,5 @@
 name: Python Unit CI
-on: 
+on:
   push:
     branches:
       - main
@@ -13,8 +13,9 @@ jobs:
       matrix:
         python: ['3.7', '3.8', '3.9', '3.10', '3.11', '3.12']
         platform: [ubuntu-latest, macos-latest, windows-latest]
-        # Python <= 3.9 is not available on macos-14
+        # Python <= 3.9 is not available on macos-latest
         # Workaround for https://github.com/actions/setup-python/issues/696
+        # Python <= 3.8 is not available on ubuntu-latest
         exclude:
         - platform: macos-latest
           python: '3.9'
@@ -22,6 +23,10 @@ jobs:
           python: '3.8'
         - platform: macos-latest
           python: '3.7'
+        - platform: ubuntu-latest
+          python: '3.8'
+        - platform: ubuntu-latest
+          python: '3.7'
         include:
         - platform: macos-latest
           python: '3.9'
@@ -29,6 +34,10 @@ jobs:
           python: '3.8'
         - platform: macos-13
           python: '3.7'
+        - platform: ubuntu-22.04
+          python: '3.8'
+        - platform: ubuntu-22.04
+          python: '3.7'
     runs-on: ${{ matrix.platform }}
     steps:
     - name: Harden Runner
@@ -39,7 +48,9 @@ jobs:
         allowed-endpoints: >
           auth.docker.io:443
           files.pythonhosted.org:443
+          api.github.com:443
           github.com:443
+          objects.githubusercontent.com:443
           production.cloudflare.docker.com:443
           pypi.org:443
           registry-1.docker.io:443
diff --git a/tox.ini b/tox.ini
index 6ba6d3b4..71550e76 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,5 +1,24 @@
 [tox]
-envlist = py{35,36,37,38,39,310}-{ubuntu-latest,macos-latest,windows-latest},lint
+envlist =
+    lint
+    py312-ubuntu-latest
+    py312-macos-latest
+    py312-windows-latest
+    py311-ubuntu-latest
+    py311-macos-latest
+    py311-windows-latest
+    py310-ubuntu-latest
+    py310-macos-latest
+    py310-windows-latest
+    py39-ubuntu-latest
+    py39-macos-13
+    py39-windows-latest
+    py38-ubuntu-22.04
+    py38-macos-13
+    py38-windows-latest
+    py37-ubuntu-22.04
+    py37-macos-13
+    py37-windows-latest
 
 [testenv]
 usedevelop = true
@@ -21,9 +40,10 @@ deps =
     twine
     isort
     mypy
+    build
 commands =
     black --check src tests setup.py conftest.py --exclude tests/test_functions/background_load_error/main.py
     isort -c src tests setup.py conftest.py
     mypy tests/test_typing.py
-    python setup.py --quiet sdist bdist_wheel
+    python -m build
     twine check dist/*