diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index 16d5b20..c197caf 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -2,6 +2,9 @@ name: Tests
 
 on: [push, pull_request]
 
+permissions:
+  contents: read
+
 jobs:
   tests:
     name: Tests
@@ -27,10 +30,12 @@ jobs:
 
     steps:
       - name: Checkout
-        uses: actions/checkout@v3
+        uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
+        with:
+          persist-credentials: false
 
       - name: Install python ${{ matrix.python-version }}
-        uses: actions/setup-python@v4
+        uses: actions/setup-python@a309ff8b426b58ec0e2a45f0f869d46889d02405 # v6.2.0
         with:
           python-version: ${{ matrix.python-version }}