diff --git a/.github/workflows/update.yaml b/.github/workflows/update.yaml
new file mode 100644
index 00000000..9b46d092
--- /dev/null
+++ b/.github/workflows/update.yaml
@@ -0,0 +1,81 @@
+name: Regenerate tld.h
+
+on: workflow_dispatch
+
+jobs:
+  generate:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Setup nodejs
+        uses: actions/setup-node@v4
+        with:
+          node-version: lts/*
+
+      - name: Checkout repository (hnsd)
+        uses: actions/checkout@v4
+        with:
+          path: hnsd
+
+      - name: Checkout repository (hs-names)
+        uses: actions/checkout@v4
+        with:
+          repository: handshake-org/hs-names
+          path: hs-names
+
+      - name: Install dependencies (hs-names)
+        run: npm --prefix=hs-names install
+
+      - name: Install dependencies (hsd)
+        run: npm --prefix=hs-names install hsd@^5
+
+      - name: Build
+        run: |
+          cd hs-names
+          ./download
+          # Workaround for https://github.com/chjj/bns/issues/41
+          sed -i '/ZONEMD/d' data/root.zone
+          ./zone.js
+          ./zone-build.js
+
+      - name: Commit/PR
+        uses: actions/github-script@v7
+        with:
+          script: |
+            const fs = require('fs');
+            const branch = `update-${new Date().getTime()}`;
+            const ref = `refs/heads/${branch}`;
+
+            await github.rest.git.createRef({
+              owner: context.repo.owner,
+              repo: context.repo.repo,
+              ref,
+              sha: context.sha
+            });
+
+            const fileOptions = {
+              owner: context.repo.owner,
+              repo: context.repo.repo,
+              path: 'src/tld.h',
+            };
+
+            const file = await github.rest.repos.getContent({
+              ...fileOptions,
+              ref
+            });
+
+            await github.rest.repos.createOrUpdateFileContents({
+              ...fileOptions,
+              message: 'Update tld.h',
+              content: Buffer.from(fs.readFileSync('hs-names/build/tld.h')).toString('base64'),
+              sha: file.data.sha,
+              branch
+            });
+
+            await github.rest.pulls.create({
+              owner: context.repo.owner,
+              repo: context.repo.repo,
+              title: 'Update tld.h',
+              head: branch,
+              base: 'master'
+            });