diff --git a/.github/workflows/python-tests.yml b/.github/workflows/python-tests.yml
index 13e271a..0f85753 100644
--- a/.github/workflows/python-tests.yml
+++ b/.github/workflows/python-tests.yml
@@ -21,7 +21,7 @@ jobs:
     - uses: actions/checkout@v3
 
     - name: Set up Python ${{ matrix.python-version }}
-      uses: actions/setup-python@v4
+      uses: actions/setup-python@83679a892e2d95755f2dac6acb0bfd1e9ac5d548 # v6
       with:
         python-version: ${{ matrix.python-version }}