diff --git a/.github/workflows/deploy.yml b/.github/workflows/deploy.yml
index 175cf46bc83..8f71f25c9f8 100644
--- a/.github/workflows/deploy.yml
+++ b/.github/workflows/deploy.yml
@@ -12,7 +12,7 @@ jobs:
   build:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11 # v4
       with:
         fetch-depth: 0
     - name: Install mdbook
@@ -24,7 +24,7 @@ jobs:
       run: |
         ./generate-book.py
     - name: Upload Artifact
-      uses: actions/upload-pages-artifact@v3.0.1
+      uses: actions/upload-pages-artifact@56afc609e74202658d3ffba0e8f6dda462b719fa # v3.0.1
       with:
         path: ./book
 
@@ -42,4 +42,4 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - id: deployment
-        uses: actions/deploy-pages@v4.0.4
+        uses: actions/deploy-pages@decdde0ac072f6dcbe43649d82d9c635fff5b4e4 # v4.0.4