diff --git a/.github/workflows/build_pages.yml b/.github/workflows/build_pages.yml
index 70315e38..1488cc82 100644
--- a/.github/workflows/build_pages.yml
+++ b/.github/workflows/build_pages.yml
@@ -35,7 +35,7 @@ jobs:
         run: python -m sphinx -T -b html -d _build/doctrees -D language=en . _build/html
 
       - name: Upload distribution artifacts
-        uses: actions/upload-pages-artifact@v5
+        uses: actions/upload-pages-artifact@fc324d3547104276b827a68afc52ff2a11cc49c9  # v5.0.0
         with:
           path: _build/html/
 
@@ -58,4 +58,4 @@ jobs:
     steps:
       - name: Deploy to GitHub Pages
         id: deployment
-        uses: actions/deploy-pages@v4 # or specific "vX.X.X" version tag for this action
+        uses: actions/deploy-pages@cd2ce8fcbc39b97be8ca5fce6e763baed58fa128  # v5.0.0