diff --git a/.github/workflows/fixup.yml b/.github/workflows/fixup.yml
index 6092cc3a..596f2a28 100644
--- a/.github/workflows/fixup.yml
+++ b/.github/workflows/fixup.yml
@@ -3,18 +3,31 @@
 # https://github.com/nextcloud/.github
 # https://docs.github.com/en/actions/learn-github-actions/sharing-workflows-with-your-organization
 
-name: Pull request checks
+name: Block fixup and squash commits
 
-on: pull_request
+on:
+  pull_request:
+    types: [opened, ready_for_review, reopened, synchronize]
+
+permissions:
+  contents: read
+
+concurrency:
+  group: fixup-${{ github.head_ref || github.run_id }}
+  cancel-in-progress: true
 
 jobs:
   commit-message-check:
+    if: github.event.pull_request.draft == false
+
+    permissions:
+      pull-requests: write
     name: Block fixup and squash commits
 
     runs-on: ubuntu-latest
 
     steps:
       - name: Run check
-        uses: xt0rted/block-autosquash-commits-action@v2
+        uses: xt0rted/block-autosquash-commits-action@79880c36b4811fe549cfffe20233df88876024e7 # v2
         with:
           repo-token: ${{ secrets.GITHUB_TOKEN }}