diff --git a/.gitea/workflows/auto-release.yml b/.gitea/workflows/auto-release.yml
index fd371f9..32018a5 100644
--- a/.gitea/workflows/auto-release.yml
+++ b/.gitea/workflows/auto-release.yml
@@ -62,7 +62,18 @@ jobs:
         shell: bash
         run: |
           ID="${{ steps.release.outputs.release_id }}"
-          curl -s -X POST \
-            -H "Authorization: token ${{ secrets.GITHUB_TOKEN }}" \
-            -F "attachment=@dsh-desktop-online.zip" \
-            "https://git.vanusys.com/api/v1/repos/${{ github.repository }}/releases/${ID}/assets"
+          API="https://git.vanusys.com/api/v1/repos/${{ github.repository }}"
+          AUTH="Authorization: token ${{ secrets.GITHUB_TOKEN }}"
+          # remove same-name old assets first
+          curl -s -H "$AUTH" "$API/releases/${ID}/assets" -o assets.json
+          python -c "
+import json
+for a in json.load(open('assets.json')):
+    if a['name'] == 'dsh-desktop-online.zip':
+        print(a['id'])
+" > old_ids.txt
+          while read AID; do
+            curl -s -X DELETE -H "$AUTH" "$API/releases/${ID}/assets/${AID}" -o /dev/null
+            echo "deleted old asset $AID"
+          done < old_ids.txt
+          curl -s -X POST -H "$AUTH" -F "attachment=@dsh-desktop-online.zip" "$API/releases/${ID}/assets"