Safety first
diff --git a/.github/workflows/type-tests.yml b/.github/workflows/type-tests.yml
index 2590e95..7c77599 100644
--- a/.github/workflows/type-tests.yml
+++ b/.github/workflows/type-tests.yml
@@ -11,6 +11,8 @@
         python-version: [3.7, 3.9]
     steps:
     - uses: actions/checkout@master
+      with:
+        persist-credentials: false
     - name: Set up Python ${{ matrix.python-version }}
       uses: actions/setup-python@v1
       with:
diff --git a/.github/workflows/unittest.yml b/.github/workflows/unittest.yml
index 74a676b..6b80c1e 100644
--- a/.github/workflows/unittest.yml
+++ b/.github/workflows/unittest.yml
@@ -14,8 +14,11 @@
 
     steps:
     - uses: actions/checkout@master
+      with:
+        persist-credentials: false
     - uses: actions/checkout@master   
       with:
+        persist-credentials: false
         repository: apache/incubator-ponymail-unit-tests
         path: pmtests
     - name: Set up Python ${{ matrix.python-version }}