diff --git a/.github/workflows/ci.yaml b/.github/workflows/ci.yaml
index e2f3e54..e4fb3db 100644
--- a/.github/workflows/ci.yaml
+++ b/.github/workflows/ci.yaml
@@ -12,7 +12,7 @@ jobs:
       uses: actions/checkout@v4
 
     - name: Set up Python
-      uses: actions/setup-python@v5
+      uses: actions/setup-python@a309ff8b426b58ec0e2a45f0f869d46889d02405 # v6
       with:
         python-version: 3.13