diff --git a/.gitea/workflows/auto_join.yaml b/.gitea/workflows/auto_join.yaml
index 5167b61..f14db19 100644
--- a/.gitea/workflows/auto_join.yaml
+++ b/.gitea/workflows/auto_join.yaml
@@ -60,6 +60,7 @@ jobs:
           curl -s -X POST \
             -H "Authorization: token $GITHUB_TOKEN" \
             -H "Accept: application/json" \
+            -H 'Content-Type: application/json' \
             $API_URL/repos/${{ github.repository }}/issues/$ISSUE_NUMBER/comments \
             -d '{"body": "$COMMENT_BODY"}'
 
@@ -71,5 +72,6 @@ jobs:
           curl -s -X PATCH \
             -H "Authorization: token $GITHUB_TOKEN" \
             -H "Accept: application/json" \
+            -H 'Content-Type: application/json' \
             $API_URL/repos/${{ github.repository }}/issues/$ISSUE_NUMBER \
             -d '{"state": "closed"}'