diff --git a/.forgejo/workflows/update-lock.yml b/.forgejo/workflows/update-lock.yml
index 9a3d651..2222e89 100644
--- a/.forgejo/workflows/update-lock.yml
+++ b/.forgejo/workflows/update-lock.yml
@@ -47,5 +47,6 @@ jobs:
           git push origin HEAD
           curl -X POST \
             'https://git.uku3lig.net/api/v1/repos/uku/actions-test/pulls' \
+            -H 'Content-Type: application/json'
             -H 'Authorization: token ${{ secrets.FORGEJO_TOKEN }}' \
-            -d '{"base": "main", "head": "update-lock-$(date -I)", "title": "chore: update flake.lock"}'
+            -d "{\"base\": \"main\", \"head\": \"update-lock-$(date -I)\", \"title\": \"chore: update flake.lock\"}"