diff --git a/.github/workflows/trivy.yml b/.github/workflows/trivy.yml
index 97d1db79..3d203e04 100644
--- a/.github/workflows/trivy.yml
+++ b/.github/workflows/trivy.yml
@@ -1,13 +1,21 @@
 name: trivy
 on:
   push:
-    branches:
-      - master
-  pull_request: 
-    branches:
-      - master
+    branches: [ "master" ]
+  pull_request:
+    # The branches below must be a subset of the branches above
+    branches: [ "master" ]
+  schedule:
+    - cron: '29 19 * * 6'
+permissions:
+  contents: read
+
 jobs:
   build:
+    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
     name: Build
     runs-on: ubuntu-20.04
     steps:
@@ -17,7 +25,7 @@ jobs:
       - name: Run Trivy vulnerability scanner in repo mode
         uses: aquasecurity/trivy-action@master
         with:
-          scan-type: 'fs'
+          scan-type: 'repo'
           ignore-unfixed: true
           format: 'sarif'
           output: 'trivy-results.sarif'
@@ -26,4 +34,4 @@ jobs:
       - name: Upload Trivy scan results to GitHub Security tab
         uses: github/codeql-action/upload-sarif@v2
         with:
-          sarif_file: 'trivy-results.sarif'
+          sarif_file: 'trivy-results.sarif'
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