diff --git a/.github/workflows/slack-alert.yml b/.github/workflows/slack-alert.yml
index c2e03c1..2e8fd9f 100644
--- a/.github/workflows/slack-alert.yml
+++ b/.github/workflows/slack-alert.yml
@@ -5,6 +5,9 @@ on:
     workflows: [tests]
     types: [completed]
 
+permissions:
+  contents: read
+
 jobs:
   on-failure:
     runs-on: ubuntu-latest