diff --git a/.github/workflows/php-docker-public.yml b/.github/workflows/php-docker-public.yml
index 533e15f..5a5d2b0 100644
--- a/.github/workflows/php-docker-public.yml
+++ b/.github/workflows/php-docker-public.yml
@@ -2,6 +2,9 @@ name: Publish Docker image
 
 on: [push]
 
+permissions:
+  contents: read
+
 env:
   DOCKER_ID: ${{ secrets.DOCKER_ID }}
   IMAGE_NAME: ${{ secrets.IMAGE_NAME }}