diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index 308c01c..ad1eb9c 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -21,9 +21,9 @@ jobs:
 
 
     steps:
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
     - name: Set up Python ${{ matrix.python-version }}
-      uses: actions/setup-python@v5
+      uses: actions/setup-python@a26af69be951a213d495a4c3e4e4022e16d87065 # v5.6.0
       with:
         python-version: ${{ matrix.python-version }}
     - name: Install dependencies
@@ -37,4 +37,4 @@ jobs:
       run: |
         echo -e '## Test results\n\n```' >> "$GITHUB_STEP_SUMMARY"
         python -m pytest -v 2>&1 | tee -a "$GITHUB_STEP_SUMMARY"
-        echo '```' >> "$GITHUB_STEP_SUMMARY"
\ No newline at end of file
+        echo '```' >> "$GITHUB_STEP_SUMMARY"