diff --git a/.github/workflows/gns-transport.yml b/.github/workflows/gns-transport.yml
index b63b596..02692b5 100644
--- a/.github/workflows/gns-transport.yml
+++ b/.github/workflows/gns-transport.yml
@@ -10,14 +10,19 @@ on:
       - "server/native_transport/**"
       - ".github/workflows/gns-transport.yml"
 
+permissions:
+  contents: read
+
 jobs:
   linux:
     name: Linux native GNS bridge
-    runs-on: [self-hosted, Linux, X64]
+    runs-on: [self-hosted, Linux, X64, co-server]
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@11d5960a326750d5838078e36cf38b85af677262
+        with:
+          persist-credentials: false
 
-      - name: Verify build dependencies (pre-provisioned on the self-hosted runner)
+      - name: Verify build dependencies
         run: |
           missing=0
           for tool in cmake ninja protoc; do