diff --git a/offline-backend-20260512/backend/config.yaml b/offline-backend-20260512/backend/config.yaml
index ac83d28f..fbf628ce 100644
--- a/offline-backend-20260512/backend/config.yaml
+++ b/offline-backend-20260512/backend/config.yaml
@@ -14,7 +14,7 @@ models:
     display_name: DeepSeek Chat
     use: langchain_openai:ChatOpenAI
     model: deepseek-chat
-    api_key: sk-e1c22b7931dc446f8b67e57878edd105
+    api_key: sk-1520028668cb4cc388ed8315ff1e856e
     base_url: https://api.deepseek.com
     request_timeout: 600.0
     max_retries: 2