diff --git a/.github/workflows/mkdocs-deploy.yml b/.github/workflows/mkdocs-deploy.yml
index c746613..b77594f 100644
--- a/.github/workflows/mkdocs-deploy.yml
+++ b/.github/workflows/mkdocs-deploy.yml
@@ -26,7 +26,7 @@ jobs:
         run: uv run mkdocs build --strict
 
       - name: Upload static files as artifact
-        uses: actions/upload-pages-artifact@v4
+        uses: actions/upload-pages-artifact@7b1f4a764d45c48632c6b24a0339c27f5614fb0b # v4
         with:
           path: ./site
 
@@ -45,4 +45,4 @@ jobs:
     steps:
       - name: Deploy to GitHub Pages
         id: deployment
-        uses: actions/deploy-pages@v4
+        uses: actions/deploy-pages@d6db90164ac5ed86f2b6aed7e0febac5b3c0c03e # v4