diff --git a/.github/workflows/c-cpp.yml b/.github/workflows/c-cpp.yml
index fbf32ec92..3eabb8527 100644
--- a/.github/workflows/c-cpp.yml
+++ b/.github/workflows/c-cpp.yml
@@ -6,13 +6,21 @@ on:
   pull_request:
     branches: [ "master" ]
 
+permissions:
+  contents: read
+
 jobs:
   build:
 
     runs-on: ubuntu-latest
 
     steps:
-    - uses: actions/checkout@v4
+    - name: Harden the runner (Audit all outbound calls)
+      uses: step-security/harden-runner@a90bcbc6539c36a85cdfeb73f7e2f433735f215b # v2.15.0
+      with:
+        egress-policy: audit
+
+    - uses: actions/checkout@34e114876b0b11c390a56381ad16ebd13914f8d5 # v4.3.1
     - name: configure
       run: ./configure
     - name: make