diff --git a/.github/workflows/newsletter.yml b/.github/workflows/newsletter.yml
index fac5805..9adf5aa 100644
--- a/.github/workflows/newsletter.yml
+++ b/.github/workflows/newsletter.yml
@@ -19,13 +19,21 @@ jobs:
       - name: Set up Node.js
         uses: actions/setup-node@v4
         with:
-          node-version: '20'
+          node-version: 18
+
+      - name: Cache npm dependencies
+        uses: actions/cache@v4
+        with:
+          path: viewer/node_modules
+          key: ${{ runner.os }}-node-${{ hashFiles('**/package-lock.json') }}
+          restore-keys: |
+            ${{ runner.os }}-node-
 
       - name: Install dependencies
-        run: npm install
+        run: cd viewer && npm install
 
       - name: Generate newsletter
-        run: node scripts/newsletter.mjs
+        run: cd viewer && node scripts/newsletter.mjs
         env:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
           EMAIL_ADDRESS: ${{ secrets.EMAIL_ADDRESS }}