diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 2854561..1dda2ae 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -18,6 +18,8 @@ jobs:
 
     steps:
       - uses: actions/checkout@v3
+        with:
+          persist-credentials: false
 
       - name: Set up Ruby 2.7
         uses: ruby/setup-ruby@v1
@@ -41,6 +43,8 @@ jobs:
 
     steps:
       - uses: actions/checkout@v3
+        with:
+          persist-credentials: false
       - uses: ruby/setup-ruby@v1
         with:
           ruby-version: ${{ matrix.ruby }}
diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index 4805296..0dd4edf 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -11,6 +11,8 @@ jobs:
 
     steps:
       - uses: actions/checkout@v3
+        with:
+          persist-credentials: false
 
       - name: Set up Ruby 2.7
         uses: ruby/setup-ruby@v1