diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index e12ace73..c53edf9f 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -60,7 +60,7 @@ jobs:
         run: python -Im flit build --format wheel
 
       - name: 🧪 Run tox targets for Python ${{ matrix.python-version }}
-        run: tox --installpkg ./dist/*.whl
+        run: tox --installpkg ./dist/*.whl -- -v 1
 
       - name: ⬆️ Upload coverage data
         uses: actions/upload-artifact@v3
@@ -90,6 +90,7 @@ jobs:
 
       - name: ＋ Generate report
         run: |
+          python -Im coverage combine
           python -Im coverage html --skip-covered --skip-empty
           python -Im coverage report
           echo "## Coverage summary" >> $GITHUB_STEP_SUMMARY
diff --git a/tests/requirements-test.txt b/tests/requirements-test.txt
new file mode 100644
index 00000000..7e8b13c4
--- /dev/null
+++ b/tests/requirements-test.txt
@@ -0,0 +1,5 @@
+flit>=3.8
+coverage[toml]>=7.0,<8.0
+factory-boy==3.2.1
+wagtail-factories>=4.1.0
+tblib==1.7.0
diff --git a/tests/requirements.txt b/tests/requirements.txt
index 525c6585..89dfdc4a 100644
--- a/tests/requirements.txt
+++ b/tests/requirements.txt
@@ -1,20 +1,14 @@
-# Test requirements.
-black>=23.7.0
-ruff=0.0.285
+pre-commit
 
 # Runtime requirements
-Django>=3.2,<5.0
-wagtail>=4.1
-graphene-django>=3.0.0
-factory-boy==3.2.1
-wagtail-factories>=4.1.0
-django-cors-headers==3.4.0
+django-cors-headers>=4.2.0
 wagtailmedia>=0.13
-wagtail-headless-preview
 dj-database-url==2.1.0
-# for postgres testing
+
 psycopg2>=2.9.5,<3.0.0
 
+# Test requirements.
+-r requirements-dev.txt
 
 # Your app in editable mode.
 -e ../
diff --git a/tox.ini b/tox.ini
index 28f83568..e18fcc4c 100644
--- a/tox.ini
+++ b/tox.ini
@@ -28,14 +28,11 @@ setenv =
 change_dir = {tox_root}/tests
 
 deps =
-    flit>=3.8
-    coverage[toml]>=7.0,<8.0
-    factory-boy==3.2.1
-    wagtail-factories>=4.1.0
-    django-cors-headers==3.4.0
+    django-cors-headers>=4.2.0
     wagtailmedia>=0.13
     dj-database-url==2.1.0
     psycopg2>=2.9.5,<3.0.0
+    -r {tox_root}/tests/requirements-test.txt
 
     django32: Django>=3.2,<3.3
     django41: Django>=4.1,<4.2
@@ -48,7 +45,7 @@ deps =
 install_command = python -Im pip install -U {opts} {packages}
 
 commands =
-    python -m coverage run manage.py test {posargs: -v 2}
+    python -m coverage run --parallel-mode manage.py test --parallel {posargs: -v 2}
 
 [testenv:coverage-report]
 ; a bit of a hack - we keep deps to a minimum, and move coverage data to the tox root for easier excludes
@@ -60,6 +57,7 @@ pre_commands =
     mv {tox_root}/tests/.coverage* {tox_root}/
 
 commands =
+    python -Im coverage combine
     python -Im coverage report -m
 
 [testenv:wagtailmain]