diff --git a/.github/workflows/close-pull-requests.yml b/.github/workflows/close-pull-requests.yml
new file mode 100644
index 00000000000..5ef42b152fa
--- /dev/null
+++ b/.github/workflows/close-pull-requests.yml
@@ -0,0 +1,30 @@
+name: 'Close Pull Requests'
+
+on:
+  pull_request_target:
+    types: opened
+  workflow_dispatch:
+
+jobs:
+  close:
+    # Avoid forks to run this job
+    if: github.repository_owner == 'moodlehq'
+    name: Close Pull Requests
+    runs-on: ubuntu-latest
+    steps:
+      - uses: dessant/repo-lockdown@v4
+        with:
+          process-only: prs
+          close-pr: true
+          pr-comment: >
+             **Please, don't open pull requests via GitHub.**
+
+
+             This repository (moodle.git) at GitHub is just a mirror of the official Moodle repository.
+
+
+             For how to contribute patches for Moodle see
+             [CONTRIBUTING.txt](https://github.com/moodle/moodle/blob/main/CONTRIBUTING.txt).
+
+
+             Closing this pull request.