diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index e62e31d..948d764 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -11,16 +11,16 @@ jobs:
   deploy:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
       - name: Configure Git Credentials
         run: |
           git config user.name eclipse-cbi-bot
           git config user.email eclipse-cbi-bot@eclipse.org
-      - uses: actions/setup-python@v5
+      - uses: actions/setup-python@0b93645e9fea7318ecaed2b359559ac225c90a2b # v5.3.0
         with:
           python-version: 3.x
       - run: echo "cache_id=$(date --utc '+%V')" >> $GITHUB_ENV 
-      - uses: actions/cache@v4
+      - uses: actions/cache@1bd1e32a3bdc45362d1e726936510720a7c30a57 # v4.2.0
         with:
           key: mkdocs-material-${{ env.cache_id }}
           path: .cache