diff --git a/.github/workflows/convert-to-qmd.yml b/.github/workflows/convert-to-qmd.yml
index 842bd66..972927c 100644
--- a/.github/workflows/convert-to-qmd.yml
+++ b/.github/workflows/convert-to-qmd.yml
@@ -11,6 +11,7 @@ jobs:
 
     permissions:
       contents: write  # Ensure the job has write permissions
+      issues: write  # Required for API calls to create and delete deploy keys
 
     steps:
     - name: Checkout the Linear_Algebra_with_Python repository
@@ -29,11 +30,32 @@ jobs:
           quarto convert "$notebook" -o "converted_chapters/$(basename "$notebook" .ipynb).qmd"
         done
 
+    - name: Generate SSH Key
+      run: |
+        ssh-keygen -t rsa -b 4096 -C "actions@github.com" -f /tmp/github_actions -N ""
+        echo "::set-output name=ssh-public-key::$(cat /tmp/github_actions.pub)"
+
+    - name: Add SSH Key to the SSH Agent
+      run: |
+        eval "$(ssh-agent -s)"
+        ssh-add /tmp/github_actions
+
+    - name: Add Deploy Key to GitHub
+      id: add_deploy_key
+      run: |
+        curl -X POST -H "Authorization: token ${{ secrets.GITHUB_TOKEN }}" \
+        -H "Accept: application/vnd.github.v3+json" \
+        https://api.github.com/repos/weijie-chen/weijie-chen.github.io/keys \
+        -d "{\"title\":\"GitHub Actions Key\",\"key\":\"$(cat /tmp/github_actions.pub)\",\"read_only\":false}" \
+        -o deploy_key.json
+        echo "::set-output name=deploy-key-id::$(jq -r .id deploy_key.json)"
+
     - name: Checkout the weijie-chen.github.io repository
       uses: actions/checkout@v4.1.7
       with:
         repository: weijie-chen/weijie-chen.github.io
         path: book_repo
+        ssh-key: /tmp/github_actions  # Use the dynamically generated SSH key
 
     - name: Copy Converted QMD Files to Book Repository
       run: |
@@ -50,11 +72,6 @@ jobs:
         sed -i '/<section class="table-of-contents">/,/<\/section>/{//!d}' book_repo/linear-algebra-with-python-book/index.html
         sed -i "/<section class=\"table-of-contents\">/a $toc" book_repo/linear-algebra-with-python-book/index.html
 
-    - name: Set up SSH Agent
-      uses: webfactory/ssh-agent@v0.5.3
-      with:
-        ssh-private-key: ${{ secrets.SSH_PRIVATE_KEY }}
-
     - name: Commit and Push Changes via SSH
       run: |
         cd book_repo
@@ -64,3 +81,9 @@ jobs:
         git add linear-algebra-with-python-book/index.html
         git commit -m "Updated chapters and Table of Contents"
         git push git@github.com:weijie-chen/weijie-chen.github.io.git main
+
+    - name: Clean Up - Remove Deploy Key from GitHub
+      run: |
+        DEPLOY_KEY_ID=$(jq -r .id deploy_key.json)
+        curl -X DELETE -H "Authorization: token ${{ secrets.GITHUB_TOKEN }}" \
+        https://api.github.com/repos/weijie-chen/weijie-chen.github.io/keys/$DEPLOY_KEY_ID
diff --git a/notebooks/Chapter 2 - Basic Matrix Algebra.ipynb b/notebooks/Chapter 2 - Basic Matrix Algebra.ipynb
index bf202cd..1820ebd 100644
--- a/notebooks/Chapter 2 - Basic Matrix Algebra.ipynb	
+++ b/notebooks/Chapter 2 - Basic Matrix Algebra.ipynb	
@@ -28,7 +28,7 @@
    "outputs": [],
    "source": [
     "from IPython.core.interactiveshell import InteractiveShell\n",
-    "InteractiveShell.ast_node_interactivity = \"all\" # display multiple lines"
+    "InteractiveShell.ast_node_interactivity = \"all\" # display multiple lines."
    ]
   },
   {