diff --git a/.github/workflows/adocs-build.yml b/.github/workflows/adocs-build.yml
index 7f32d0d..879ae9d 100644
--- a/.github/workflows/adocs-build.yml
+++ b/.github/workflows/adocs-build.yml
@@ -10,7 +10,7 @@ jobs:
     name: asciidoctor -D docs --backend=html5 -o index.html -a toc2 docs/index.adoc
     steps:
     - name: Checkout code
-      uses: actions/checkout@v4
+      uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
     - name: Get build container
       id: adocbuild
       uses: tonynv/asciidoctor-action@master
@@ -19,7 +19,7 @@ jobs:
     - name: Print execution time
       run: echo "Time ${{ steps.adocbuild.outputs.time }}"
     - name: Deploy docs to ghpages
-      uses: peaceiris/actions-gh-pages@v4
+      uses: peaceiris/actions-gh-pages@4f9cc6602d3f66b9c108549d475ec49e8ef4d45e # v4.0.0
       with:
         deploy_key: ${{ secrets.ACTIONS_DEPLOY_KEY }}
         publish_branch: gh-pages
diff --git a/.github/workflows/netlify-deploy.yaml b/.github/workflows/netlify-deploy.yaml
index cee987d..b725a08 100644
--- a/.github/workflows/netlify-deploy.yaml
+++ b/.github/workflows/netlify-deploy.yaml
@@ -13,12 +13,9 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-      - name: Setup Graphviz
-        uses: ts-graphviz/setup-graphviz@v2.0.2
+      - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
 
-      - uses: actions/checkout@v4.2.2
-
-      - uses: actions/setup-java@v4.5.0
+      - uses: actions/setup-java@8df1039502a15bceb9433410b1a100fbe190c53b # v4.5.0
         with:
           java-version: '17'
           distribution: 'temurin'
@@ -30,7 +27,7 @@ jobs:
       - name: Generate Site
         run: mvn generate-resources
 
-      - uses: jsmrcaga/action-netlify-deploy@v2.3.0
+      - uses: jsmrcaga/action-netlify-deploy@06b6a09e152823cce0d76c0dbb22b914934de198 # v2.3.0
         with:
           build_directory: ./target/generated-docs/
           install_command: "echo Skipping installing the dependencies"