diff --git a/.github/workflows/preview-deploy.yml b/.github/workflows/preview-deploy.yml
index eff9c847a..269adf510 100644
--- a/.github/workflows/preview-deploy.yml
+++ b/.github/workflows/preview-deploy.yml
@@ -82,6 +82,16 @@ jobs:
           sed -i "s/\${PR_NUMBER}/${{ github.event.pull_request.number }}/g" src/index.ts
           cat wrangler.toml
 
+      - name: Delete existing preview Worker before redeploy
+        env:
+          CLOUDFLARE_API_TOKEN: ${{ secrets.CLOUDFLARE_API_TOKEN }}
+          CLOUDFLARE_ACCOUNT_ID: ${{ secrets.CLOUDFLARE_ACCOUNT_ID }}
+        working-directory: workers/preview
+        run: |
+          WORKER_NAME="sure-preview-${{ github.event.pull_request.number }}"
+          echo "Ensuring fresh preview deployment for $WORKER_NAME"
+          npx wrangler delete --name "$WORKER_NAME" --force || echo "Existing preview not found; continuing"
+
       - name: Create GitHub Deployment
         id: deployment
         uses: actions/github-script@v7