diff --git a/.github/workflows/static.yml b/.github/workflows/static.yml
index 35b1a52b..553b7add 100644
--- a/.github/workflows/static.yml
+++ b/.github/workflows/static.yml
@@ -29,17 +29,17 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout
-        uses: actions/checkout@v3
+        uses: actions/checkout@f43a0e5ff2bd294095638e18286ca9a3d1956744 #v3.6.0
       - name: Setup Pages
-        uses: actions/configure-pages@v3
+        uses: actions/configure-pages@b8130d9ab958b325bbde9786d62f2c97a9885a0e #v3.0.7
       - name: Install LaTeX
         run: ./.doc/install-latex-ubuntu.sh
       - name: Build WebSite
         run: ./.doc/build.sh
       - name: Upload artifact
-        uses: actions/upload-pages-artifact@v1
+        uses: actions/upload-pages-artifact@56afc609e74202658d3ffba0e8f6dda462b719fa #v3.0.1
         with:
           path: './target/doc/'
       - name: Deploy to GitHub Pages
         id: deployment
-        uses: actions/deploy-pages@v1
+        uses: actions/deploy-pages@d6db90164ac5ed86f2b6aed7e0febac5b3c0c03e #v4.0.5