diff --git a/.github/workflows/prettier-html.yml b/.github/workflows/prettier-html.yml
index 3dc4326e..eeaaa480 100644
--- a/.github/workflows/prettier-html.yml
+++ b/.github/workflows/prettier-html.yml
@@ -3,6 +3,9 @@ name: Prettify gh-pages
 on:
   workflow_dispatch:
 
+permissions:
+  contents: write
+
 jobs:
   format:
     runs-on: ubuntu-latest