diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index d97598e..5e50e8b 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -7,7 +7,7 @@ jobs:
   build-site:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v5
 
       - name: Install GraphicsMagick
         run: sudo apt install graphicsmagick
@@ -18,13 +18,13 @@ jobs:
           sudo apt install ./google-chrome-stable_current_amd64.deb
 
       - name: Use Node.js ${{ matrix.node-version }}
-        uses: actions/setup-node@v2
+        uses: actions/setup-node@v4
         with:
           node-version: '14'
           cache: 'npm'
 
       - name: Restore node_modules cache
-        uses: actions/cache@v2
+        uses: actions/cache@v4
         with:
           path: node_modules
           key: ${{ runner.os }}-node_modules-${{ hashFiles('**/package-lock.json') }}
@@ -32,7 +32,7 @@ jobs:
             ${{ runner.os }}-node_modules
 
       - name: Restore Asset Cache
-        uses: actions/cache@v2
+        uses: actions/cache@v4
         with:
           key: if-cache
           path: |
@@ -49,6 +49,11 @@ jobs:
       - name: Build site
         run: npm run build
 
+      - name: Spawn HTTP server
+        uses: Eun/http-server-action@v1
+        with:
+          directory: dist
+
       - name: (EN) Generate PDF from HTML
         run: |
           google-chrome --headless --print-to-pdf-no-header \
@@ -101,7 +106,7 @@ jobs:
         run: ls -la ${{ github.workspace }}/dist
 
       - name: Upload PDFs
-        uses: actions/upload-artifact@v3
+        uses: actions/upload-artifact@v4
         with:
           name: site-pdfs
           path: |
diff --git a/build/engines.js b/build/engines.js
index 7f624af..422d2e8 100644
--- a/build/engines.js
+++ b/build/engines.js
@@ -38,6 +38,7 @@ const markdownEngines = {
     typographer: true,
   })
     .enable('image')
+    .use(require('markdown-it-footnote'))
     .use(require('markdown-it-link-attributes'), {
       pattern: /^https?:/,
       attrs: {
diff --git a/build/page-tweets.js b/build/page-tweets.js
index c8e832a..a8aa923 100644
--- a/build/page-tweets.js
+++ b/build/page-tweets.js
@@ -1,4 +1,4 @@
-const { chunk, uniq, uniqBy, difference } = require('lodash');
+const { uniq, uniqBy, difference } = require('lodash');
 const fs = require('fs-extra');
 const { resolve } = require('./resolve');
 const log = require('fancy-log');
@@ -32,6 +32,7 @@ function applyI18N (original_tweet, twitter_i18n) {
 }
 
 module.exports = exports = async function tweets (pages) {
+  // eslint-disable-next-line no-unused-vars
   const [ twitter, twitterBackup, twitterCache ] = await Promise.all([
     fs.readJson(resolve('twitter-config.json')).catch(() => null)
       .then(getTwitterClient),
diff --git a/build/twitter-client.js b/build/twitter-client.js
index 5499ea2..309fad8 100644
--- a/build/twitter-client.js
+++ b/build/twitter-client.js
@@ -1,6 +1,6 @@
 const fs = require('fs-extra');
 const { resolve } = require('./resolve');
-const { chunk, uniq, difference } = require('lodash');
+const { uniq, difference } = require('lodash');
 const Twitter = require('twitter-lite');
 const log = require('fancy-log');
 const tweetparse = require('./lib/tweetparse');
diff --git a/gulp/cloudfront.js b/gulp/cloudfront.js
index 9bb53f9..34741e9 100644
--- a/gulp/cloudfront.js
+++ b/gulp/cloudfront.js
@@ -4,7 +4,7 @@ var Promise = require('bluebird');
 
 var credentials;
 try {
-  credentials = require('../aws.json');
+  credentials = require('../aws.json'); // eslint-disable-line import/no-unresolved
 } catch (e) {
   credentials = null;
 }
diff --git a/gulp/publish.js b/gulp/publish.js
index 328d723..e7d09a2 100644
--- a/gulp/publish.js
+++ b/gulp/publish.js
@@ -5,7 +5,7 @@ const parallelize = require('concurrent-transform');
 
 var credentials;
 try {
-  credentials = require('../aws.json');
+  credentials = require('../aws.json'); // eslint-disable-line import/no-unresolved
 } catch (e) {
   credentials = null;
 }