diff --git a/.gitea/workflows/autograde.yml b/.gitea/workflows/autograde.yml
index 4529170..7cdb19d 100644
--- a/.gitea/workflows/autograde.yml
+++ b/.gitea/workflows/autograde.yml
@@ -230,7 +230,7 @@ jobs:
           mkdir -p .autograde
           
           # Create minimal grade_grouped.py script
-          cat > .autograde/grade_grouped.py << 'EOF'
+          cat > .autograde/grade_grouped.py <<- 'EOF'
 import json
 import sys
 import argparse
@@ -399,9 +399,9 @@ EOF
             CONTENT=$(base64 -w 0 "$REPORT_FILE")
             
             # 创建请求 JSON 文件
-            cat > /tmp/upload_request.json << EOF
-          {"message": "Add grade report for $SHORT_SHA", "content": "$CONTENT"}
-          EOF
+          cat > /tmp/upload_request.json << EOF
+{"message": "Add grade report for $SHORT_SHA", "content": "$CONTENT"}
+EOF
             
             # 先尝试 POST 创建新文件
             RESULT=$(curl -s -X POST -H "Authorization: token $TOKEN" \
@@ -421,8 +421,8 @@ EOF
               if [ -n "$SHA" ]; then
                 # 创建更新请求 JSON 文件
                 cat > /tmp/upload_request.json << EOF
-          {"message": "Update grade report for $SHORT_SHA", "content": "$CONTENT", "sha": "$SHA"}
-          EOF
+{"message": "Update grade report for $SHORT_SHA", "content": "$CONTENT", "sha": "$SHA"}
+EOF
                 
                 RESULT=$(curl -s -X PUT -H "Authorization: token $TOKEN" \
                   -H "Content-Type: application/json" \