diff --git a/.github/workflows/rusty-v8-release.yml b/.github/workflows/rusty-v8-release.yml
index a2f620aa8f..37c8c65370 100644
--- a/.github/workflows/rusty-v8-release.yml
+++ b/.github/workflows/rusty-v8-release.yml
@@ -316,6 +316,7 @@ jobs:
           ref: v${{ needs.metadata.outputs.v8_version }}
           path: upstream-rusty-v8
           submodules: recursive
+          persist-credentials: false
 
       - name: Set up Python
         uses: actions/setup-python@a309ff8b426b58ec0e2a45f0f869d46889d02405 # v6.2.0
diff --git a/.github/workflows/v8-canary.yml b/.github/workflows/v8-canary.yml
index b804086389..29cb72e7c5 100644
--- a/.github/workflows/v8-canary.yml
+++ b/.github/workflows/v8-canary.yml
@@ -317,6 +317,8 @@ jobs:
 
     steps:
       - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6
+        with:
+          persist-credentials: false
 
       - id: setup_ci
         uses: ./.github/actions/setup-ci
@@ -332,6 +334,7 @@ jobs:
           ref: v${{ needs.metadata.outputs.v8_version }}
           path: upstream-rusty-v8
           submodules: recursive
+          persist-credentials: false
 
       - name: Set up Python
         uses: actions/setup-python@a309ff8b426b58ec0e2a45f0f869d46889d02405 # v6