diff --git a/code-scanning/psalm.yml b/code-scanning/psalm.yml
index d6226a1..d35787e 100644
--- a/code-scanning/psalm.yml
+++ b/code-scanning/psalm.yml
@@ -9,13 +9,21 @@ on:
   push:
     branches: [ $default-branch, $protected-branches ]
   pull_request:
+    # The branches below must be a subset of the branches above
     branches: [ $default-branch ]
   schedule:
     - cron: $cron-weekly
 
+permissions:
+  contents: read
+
 jobs:
   php-security:
     runs-on: ubuntu-latest
+    permissions:
+      contents: read # for actions/checkout to fetch code
+      security-events: write # for github/codeql-action/upload-sarif to upload SARIF results
+      actions: read # only required for a private repository by github/codeql-action/upload-sarif to get the Action run status
 
     steps:
       - name: Checkout code
@@ -27,4 +35,4 @@ jobs:
       - name: Upload Security Analysis results to GitHub
         uses: github/codeql-action/upload-sarif@v1
         with:
-          sarif_file: results.sarif
\ No newline at end of file
+          sarif_file: results.sarif