diff --git a/.gitea/workflows/claude.yml b/.gitea/workflows/claude.yml
index 7f0bdd5..80a5b99 100644
--- a/.gitea/workflows/claude.yml
+++ b/.gitea/workflows/claude.yml
@@ -12,6 +12,8 @@ on:
 jobs:
   claude-response:
     runs-on: yellow-zeabur-runner
+    env:
+      RUNNER_TEMP: /tmp
     steps:
       - uses: actions/checkout@v4
         with:
@@ -24,6 +26,7 @@ jobs:
           claude_git_email: claude@anthropic.com
           path_to_claude_code_executable: /usr/local/bin/claude
           claude_args: |
+            --model claude-sonnet-5
             --append-system-prompt "請一律使用繁體中文回覆，包含 issue/PR 留言、commit message 說明文字、todo list 項目。程式碼註解與變數命名維持英文慣例即可。"
         env:
           GITEA_SERVER_URL: https://yellow-git.zeabur.app
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