diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index 26f7d543..a3f9e939 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -12,14 +12,14 @@ jobs:
         python: ['3.8']
         os: [ubuntu-latest]
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
       - name: Set up Python
-        uses: actions/setup-python@v2
+        uses: actions/setup-python@v5
         with:
           python-version: ${{ matrix.python }}
 
       # Install dependencies.
-      - uses: actions/cache@v2
+      - uses: actions/cache@v3
         name: Python cache with dependencies.
         id: python-cache
         with:
diff --git a/.github/workflows/verify.yml b/.github/workflows/verify.yml
index d4c3e44c..0da2c523 100644
--- a/.github/workflows/verify.yml
+++ b/.github/workflows/verify.yml
@@ -10,14 +10,14 @@ jobs:
         python: ['3.8']
         os: [ubuntu-latest]
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
       - name: Set up Python
-        uses: actions/setup-python@v2
+        uses: actions/setup-python@v5
         with:
           python-version: ${{ matrix.python }}
 
       # Install dependencies.
-      - uses: actions/cache@v2
+      - uses: actions/cache@v3
         name: Python cache with dependencies.
         id: python-cache
         with:
@@ -26,7 +26,7 @@ jobs:
       - name: Install dependencies.
         run: |
           python -m pip install --upgrade pip
-          pip install -r dev_requirements.pip
+          pip install -e .[dev]
           pip list
 
       # Linter.
@@ -45,14 +45,14 @@ jobs:
           - os: windows-latest
             windows_nose_args: --traverse-namespace ./tests
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
       - name: Set up Python
-        uses: actions/setup-python@v2
+        uses: actions/setup-python@v5
         with:
           python-version: ${{ matrix.python }}
 
       # Install dependencies.
-      - uses: actions/cache@v2
+      - uses: actions/cache@v3
         name: Python cache with dependencies.
         id: python-cache
         with:
@@ -61,22 +61,22 @@ jobs:
       - name: Install dependencies.
         run: |
           python -m pip install --upgrade pip
-          pip install -r dev_requirements.pip
+          pip install -e .[dev]
           pip list
 
       # Tests.
       - name: Run tests
-        run: nosetests -v -v ${{ matrix.windows_nose_args }}
+        run: python -m unittest
 
       # Build and Upload.
       - name: Build sdist and wheel.
+        if: success()
         run: |
-          pip install wheel
-          python clean_for_build.py
-          python setup.py sdist bdist_wheel
+          pip install flit==3.9.0
+          flit --debug build --no-use-vcs
       - name: Upload sdist and wheel.
         if: success()
-        uses: actions/upload-artifact@v2
+        uses: actions/upload-artifact@v3
         with:
           name: pyxform--on-${{ matrix.os }}--py${{ matrix.python }}
           path: ${{ github.workspace }}/dist/pyxform*