diff --git a/.github/workflows/python-tests.yml b/.github/workflows/python-tests.yml
index 13e271a..521ccd8 100644
--- a/.github/workflows/python-tests.yml
+++ b/.github/workflows/python-tests.yml
@@ -18,10 +18,10 @@ jobs:
         python-version: ['3.10', '3.11', '3.12', '3.13', '3.14']
 
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@f43a0e5ff2bd294095638e18286ca9a3d1956744 # v3
 
     - name: Set up Python ${{ matrix.python-version }}
-      uses: actions/setup-python@v4
+      uses: actions/setup-python@7f4fc3e22c37d6ff65e88745f38bd3157c663f7c # v4
       with:
         python-version: ${{ matrix.python-version }}
 
@@ -48,7 +48,7 @@ jobs:
         echo "${{ steps.test_results.outputs.TEST_COUNT }}" > test-results/test-count.txt
 
     - name: Upload test results
-      uses: actions/upload-artifact@v4
+      uses: actions/upload-artifact@ea165f8d65b6e75b540449e92b4886f43607fa02 # v4
       with:
         name: test-results-${{ matrix.python-version }}
         path: test-results/