diff --git a/.github/workflows/CI.yml b/.github/workflows/CI.yml
index 8247d049616510..e306df53c09140 100644
--- a/.github/workflows/CI.yml
+++ b/.github/workflows/CI.yml
@@ -1,11 +1,25 @@
 name: CI
 on: pull_request
 
+permissions:
+  contents: read
+
 jobs:
   test:
     runs-on: ubuntu-latest
 
     steps:
+      - name: Harden Runner
+        uses: step-security/harden-runner@v1
+        with:
+          egress-policy: block
+          disable-telemetry: true
+          allowed-endpoints: >
+            api.github.com:443
+            github.com:443
+            raw.githubusercontent.com:443
+            registry.npmjs.org:443
+
       - uses: actions/checkout@v2
       - uses: actions/setup-node@v1
         with: