diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index cea6945..a1852b8 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -11,6 +11,10 @@ jobs:
   build:
     runs-on: ubuntu-latest
     steps:
+      - uses: step-security/harden-runner@63c24ba6bd7ba022e95695ff85de572c04a18142 # v2.7.0
+        with:
+          egress-policy: audit
+
       - name: checkout
         uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11 # v4.1.1