diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index f2bf975b..901ac4f1 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -16,7 +16,6 @@ jobs:
     - name: Dispatch to RRC
       run: |
         curl -X POST -H "Authorization: token ${{ secrets.RRCOURSE }}" \
-        -H "Content-Type: application/json" \
         -H "Accept: application/vnd.github.everest-preview+json" \
         --data "{"event_type": "quarto", "client_payload": {"branch": "$GITHUB_HEAD_REF"}}" \
         https://api.github.com/repos/nceas/repro-research-course/dispatches \