diff --git a/.github/workflows/build-lmnb.yml b/.github/workflows/build-lmnb.yml
index ff4a433..909e9d7 100644
--- a/.github/workflows/build-lmnb.yml
+++ b/.github/workflows/build-lmnb.yml
@@ -14,15 +14,15 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
 
     - name: Install build dependencies
-      run: python -m pip install --upgrade build
+      run: python -m pip install --upgrade pdm
 
     - name: Build source distribution
-      run: python -m build
+      run: pdm
 
-    - uses: actions/upload-artifact@v3
+    - uses: actions/upload-artifact@v4
       with:
         name: artifacts
         path: dist/*
@@ -35,7 +35,7 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-    - uses: actions/download-artifact@v3
+    - uses: actions/download-artifact@v4
       with:
         name: artifacts
         path: dist
diff --git a/.github/workflows/ruff.yml b/.github/workflows/ruff.yml
index 5f8c82d..cf7600a 100644
--- a/.github/workflows/ruff.yml
+++ b/.github/workflows/ruff.yml
@@ -8,3 +8,4 @@ jobs:
       - uses: astral-sh/ruff-action@v1
         with:
           args: 'format --check'
+          src: './src'
diff --git a/pyproject.toml b/pyproject.toml
index cbd280b..7212483 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -37,6 +37,7 @@ lines-after-imports = 2
 [tool.ruff.format]
 # Like Black, use double quotes for strings.
 quote-style = "double"
+exclude = ["*.ipynb"]
 
 # Like Black, indent with spaces, rather than tabs.
 indent-style = "space"