diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 6e2b762b18f..9919e246203 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -169,6 +169,8 @@ jobs:
     steps:
       - name: Checkout repo
         uses: actions/checkout@v2
+        with:
+          persist-credentials: false
 
       - name: Deepen cloned repo
         run: 'git fetch --deepen=${{ github.event.pull_request.commits || 1 }}'
@@ -193,6 +195,8 @@ jobs:
     steps:
       - name: Checkout repo
         uses: actions/checkout@v2
+        with:
+          persist-credentials: false
 
       - name: Deepen cloned repo
         run: 'git fetch --deepen=${{ github.event.pull_request.commits || 1 }}'