diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 05c4e7fb..d99c7aa6 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -13,12 +13,12 @@ jobs:
   main:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@692973e3d937129bcbf40652eb9f2f61becf3332 # v4
         with:
           # We need to fetch all branches and commits so that Nx affected has a base to compare against.
           fetch-depth: 0
-      - uses: nrwl/nx-set-shas@v4
-      - uses: actions/setup-node@v4
+      - uses: nrwl/nx-set-shas@40f1175ceec169e68c9857c27aa7c5063692aa9a # v4
+      - uses: actions/setup-node@1e60f620b9541d16bece96c5465dc8ee9832be0b # v4
         with:
           node-version: 18
           cache: 'npm'
diff --git a/.github/workflows/lint-pr.yml b/.github/workflows/lint-pr.yml
index d2c42161..36f1191c 100644
--- a/.github/workflows/lint-pr.yml
+++ b/.github/workflows/lint-pr.yml
@@ -12,6 +12,6 @@ jobs:
     name: Validate PR title
     runs-on: ubuntu-latest
     steps:
-      - uses: amannn/action-semantic-pull-request@v5
+      - uses: amannn/action-semantic-pull-request@0723387faaf9b38adef4775cd42cfd5155ed6017 # v5
         env:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
diff --git a/.github/workflows/release-please.yml b/.github/workflows/release-please.yml
index 98e9e8d2..4a0d922d 100644
--- a/.github/workflows/release-please.yml
+++ b/.github/workflows/release-please.yml
@@ -13,7 +13,7 @@ jobs:
     runs-on: ubuntu-latest
     # Release-please creates a PR that tracks all changes
     steps:
-      - uses: google-github-actions/release-please-action@v3
+      - uses: google-github-actions/release-please-action@db8f2c60ee802b3748b512940dde88eabd7b7e01 # v3
         id: release
         with:
           command: manifest
@@ -29,12 +29,12 @@ jobs:
     if: ${{ needs.release-please.outputs.release_created }}
     steps:
       - name: Checkout
-        uses: actions/checkout@v4
+        uses: actions/checkout@692973e3d937129bcbf40652eb9f2f61becf3332 # v4
         with:
           ref: ${{ needs.release-please.outputs.release_tag_name }}
 
       - name: Log in to the Container registry
-        uses: docker/login-action@v2
+        uses: docker/login-action@465a07811f14bebb1938fbed4728c6a1ff8901fc # v2
         with:
           registry: ${{ env.REGISTRY }}
           username: ${{ github.actor }}
@@ -42,7 +42,7 @@ jobs:
 
       - name: Extract metadata (tags, labels) for Docker
         id: meta
-        uses: docker/metadata-action@v4
+        uses: docker/metadata-action@818d4b7b91585d195f67373fd9cb0332e31a7175 # v4
         with:
           images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
 
@@ -51,15 +51,15 @@ jobs:
         run: echo "::set-output name=date::$(date +'%Y-%m-%d')"
 
       - name: Set up QEMU
-        uses: docker/setup-qemu-action@v3
+        uses: docker/setup-qemu-action@49b3bc8e6bdd4a60e6116a5414239cba5943d3cf # v3
 
       - name: Set up Docker Buildx
-        uses: docker/setup-buildx-action@v3
+        uses: docker/setup-buildx-action@aa33708b10e362ff993539393ff100fa93ed6a27 # v3
         with:
           platforms: linux/amd64,linux/arm64
 
       - name: Build App Container
-        uses: docker/build-push-action@v4
+        uses: docker/build-push-action@0a97817b6ade9f46837855d676c4cca3a2471fc9 # v4
         with:
           context: .
           file: ./packages/app/Dockerfile
@@ -76,7 +76,7 @@ jobs:
             DATE=${{ steps.date.outputs.date }}
 
       - name: Build Fibonacci Service Container
-        uses: docker/build-push-action@v4
+        uses: docker/build-push-action@0a97817b6ade9f46837855d676c4cca3a2471fc9 # v4
         with:
           context: .
           file: ./packages/fibonacci-service/Dockerfile