diff --git a/bincio/serve/routers/ideas.py b/bincio/serve/routers/ideas.py
index 3a3c38e..7d73477 100644
--- a/bincio/serve/routers/ideas.py
+++ b/bincio/serve/routers/ideas.py
@@ -224,6 +224,6 @@ async def submit_feedback(
         except (OSError, json.JSONDecodeError):
             existing = []
     existing.append(entry)
-    log_file.write_text(json.dumps(existing, indent=2))
+    log_file.write_text(json.dumps(existing, indent=2, ensure_ascii=False), encoding="utf-8")
 
     return JSONResponse({"ok": True, "id": submission_id})