diff --git a/.github/workflows/deploy-book.yml b/.github/workflows/deploy-book.yml
index 52059e4b..ee7c9850 100644
--- a/.github/workflows/deploy-book.yml
+++ b/.github/workflows/deploy-book.yml
@@ -51,8 +51,10 @@ jobs:
         env:
           CRAN_REPO: https://packagemanager.posit.co/cran/__linux__/noble/2026-10-01
         run: |
+          . .venv/bin/activate
           Rscript -e 'options(repos = c(CRAN = Sys.getenv("CRAN_REPO"))); install.packages(readLines("requirements-r.txt"))'
-          Rscript -e 'IRkernel::installspec(name = "ir", displayname = "R", user = TRUE)'
+          ir_kernel_spec=$(Rscript -e 'cat(system.file("kernelspec", package = "IRkernel"))')
+          jupyter kernelspec install --user --replace --name ir "$ir_kernel_spec"
 
       - name: Verify notebook kernels
         run: |
@@ -93,7 +95,7 @@ jobs:
         env:
           MQB_NOTEBOOK_REPOSITORY: ${{ github.event.pull_request.head.repo.full_name || github.repository }}
           MQB_NOTEBOOK_REF: ${{ github.event.pull_request.head.sha || github.sha }}
-        run: PYTHONPATH="$GITHUB_WORKSPACE:$GITHUB_WORKSPACE/content/code" make test BOOK_CONFIG=content/_config_ci.yml BOOK_BUILD_ARGS=--all
+        run: PYTHONPATH="$GITHUB_WORKSPACE" make test BOOK_CONFIG=content/_config_ci.yml BOOK_BUILD_ARGS=--all
 
       - name: Upload built book
         uses: actions/upload-artifact@v7
diff --git a/content/notebooks/appendix-data-python.ipynb b/content/notebooks/appendix-data-python.ipynb
index 581ed10f..04930ae5 100755
--- a/content/notebooks/appendix-data-python.ipynb
+++ b/content/notebooks/appendix-data-python.ipynb
@@ -244,7 +244,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 5,
+   "execution_count": null,
    "metadata": {},
    "outputs": [
     {
@@ -306,7 +306,7 @@
     "MyDF = pd.DataFrame({\n",
     "   'col1': ['Var1', 'Var2', 'Var3', 'Var4'],\n",
     "   'col2': ['Grass', 'rabbit', 'Fox', 'Wolf'],\n",
-    "   'col3': [1, 2, sc.nan, 4]\n",
+    "   'col3': [1, 2, float('nan'), 4]\n",
     "})\n",
     "\n",
     "MyDF"