diff --git a/.github/workflows/pypi-publish.yml b/.github/workflows/pypi-publish.yml
index 62e239a..0b28bb2 100644
--- a/.github/workflows/pypi-publish.yml
+++ b/.github/workflows/pypi-publish.yml
@@ -47,8 +47,20 @@ jobs:
     name: Test
     needs: build
     if: github.event_name == 'release' || inputs.run_tests
-    runs-on: ubuntu-latest
-    timeout-minutes: 60
+    runs-on: ${{ matrix.os }}
+    env:
+      SYSTEM_VERSION_COMPAT: 0  # See https://github.com/actions/setup-python/issues/279.
+    timeout-minutes: 120
+    strategy:
+      fail-fast: false
+      matrix:
+        os:
+          - macos-12
+          - macos-latest
+          - ubuntu-20.04
+          - ubuntu-latest
+        python-version:
+          - '3.11'
     steps:
       - name: Load artifact
         uses: actions/download-artifact@fa0a91b85d4f404e444e00e005971372dc801d16
@@ -58,7 +70,7 @@ jobs:
       - name: Set up Python
         uses: actions/setup-python@f677139bbe7f9c59b41e40162b753c062f5d49a3
         with:
-          python-version: '3.11'
+          python-version: ${{ matrix.python-version }}
       - name: Install Python dependencies
         run: |
           pip install --upgrade pip
diff --git a/.github/workflows/pypi-test.yml b/.github/workflows/pypi-test.yml
index 04de36d..b6154fe 100644
--- a/.github/workflows/pypi-test.yml
+++ b/.github/workflows/pypi-test.yml
@@ -57,7 +57,8 @@ jobs:
       - name: Install Python dependencies
         run: |
           pip install --upgrade pip
-          pip install pytest-xdist setuptools
+          pip install --upgrade setuptools
+          pip install pytest-xdist
 
       - name: Install from PyPI
         run: |
@@ -66,4 +67,5 @@ jobs:
           pip list
 
       - name: Test installation
-        run: pytest --pyargs concordia
+        run: |
+          pytest -n auto --pyargs concordia
diff --git a/.github/workflows/sdist-test.yml b/.github/workflows/sdist-test.yml
index b96b07a..039004f 100644
--- a/.github/workflows/sdist-test.yml
+++ b/.github/workflows/sdist-test.yml
@@ -4,13 +4,22 @@ name: sdist-test
 
 on:
   workflow_dispatch:
+    inputs:
+      runs-on:
+        description: 'OS to run on.'
+        type: string
+        default: 'ubuntu-latest'
+      python-version:
+        description: 'Python version to use.'
+        type: string
+        default: '3.11'
 
 permissions: read-all
 
 jobs:
   sdist-test:
     name: Test sdist
-    runs-on: ubuntu-latest
+    runs-on:  ${{ inputs.runs-on }}
     timeout-minutes: 90
 
     steps:
@@ -23,16 +32,18 @@ jobs:
       - name: Set up Python
         uses: actions/setup-python@f677139bbe7f9c59b41e40162b753c062f5d49a3
         with:
-          python-version: '3.11'
+          python-version: ${{ inputs.python-version }}
 
       - name: Install Python dependencies
         run: |
           pip install --upgrade pip
-          pip install pytest-xdist setuptools
+          pip install --upgrade setuptools
+          pip install pytest-xdist
 
       - name: Install source distribution
         run: |
           pip install dist/*.tar.gz
+          pip list
 
       - name: Test source distribution
         run: |
diff --git a/.github/workflows/test-concordia.yml b/.github/workflows/test-concordia.yml
index 0c43a31..19349d6 100644
--- a/.github/workflows/test-concordia.yml
+++ b/.github/workflows/test-concordia.yml
@@ -32,26 +32,13 @@ permissions: read-all
 jobs:
   test-concordia:
     name: Test Concordia
-    runs-on: ${{ matrix.os }}
-    env:
-      SYSTEM_VERSION_COMPAT: 0  # See https://github.com/actions/setup-python/issues/279.
-    timeout-minutes: 120
-    strategy:
-      fail-fast: ${{ github.event_name != 'workflow_dispatch' }}
-      matrix:
-        os:
-          - macos-12
-          - ubuntu-20.04
-        python-version:
-          - '3.11'
+    runs-on: ubuntu-latest
     steps:
       - name: Checkout Concordia
         uses: actions/checkout@692973e3d937129bcbf40652eb9f2f61becf3332
 
       - name: Install Concordia
         uses: ./.github/actions/install-concordia
-        with:
-          python-version: ${{ matrix.python-version }}
 
       - name: Test Concordia
         run: pytest concordia