diff --git a/.github/workflows/check-docker-image-is-used.yml b/.github/workflows/check-docker-image-is-used.yml
index ecbb012..60e7bde 100644
--- a/.github/workflows/check-docker-image-is-used.yml
+++ b/.github/workflows/check-docker-image-is-used.yml
@@ -4,10 +4,18 @@
    pull_request:
      branches: [ main ]
 
+ permissions:
+   contents: read
+
  jobs:
    check-docker-image-is-used:
      runs-on: ubuntu-latest
      steps:
-      - uses: actions/checkout@v6
+      - name: Harden the runner (Audit all outbound calls)
+        uses: step-security/harden-runner@a5ad31d6a139d249332a2605b85202e8c0b78450 # v2.19.1
+        with:
+          egress-policy: audit
+
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
       - name: Check action will use image
         run: yq -e '.runs.image=="docker://ghcr.io/contrast-security-oss/integration-verify:main"' action.yaml || { echo "::error file=action.yaml,line=$(yq '.runs.image|line' action.yaml),column=$(yq '.runs.image|column' action.yaml),endColumn=$(yq '(.runs.image|column)+(.runs.image|length)' action.yaml)::Action is not configured to use built Docker image" && exit 1; }
diff --git a/.github/workflows/docker-publish.yml b/.github/workflows/docker-publish.yml
index b16fd85..42407d9 100644
--- a/.github/workflows/docker-publish.yml
+++ b/.github/workflows/docker-publish.yml
@@ -12,6 +12,9 @@ env:
   REGISTRY: ghcr.io
   IMAGE_NAME: contrast-security-oss/integration-verify
 
+permissions:
+  contents: read
+
 jobs:
   build-and-push-image:
     runs-on: ubuntu-latest
@@ -20,17 +23,22 @@ jobs:
       packages: write
 
     steps:
+      - name: Harden the runner (Audit all outbound calls)
+        uses: step-security/harden-runner@a5ad31d6a139d249332a2605b85202e8c0b78450 # v2.19.1
+        with:
+          egress-policy: audit
+
       - name: Checkout repository
-        uses: actions/checkout@v6
+        uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
 
       - name: Set up QEMU
-        uses: docker/setup-qemu-action@v3
+        uses: step-security/setup-qemu-action@109c6ed9f089be1a250c75fd6a534e30df44e030 # v4.0.0
 
       - name: Setup Docker Buildx
-        uses: docker/setup-buildx-action@v3
+        uses: step-security/setup-buildx-action@f931205d68723ad9589fd2a7e2ece238bf9de341 # v4.0.0
 
       - name: Log in to the Container registry
-        uses: docker/login-action@v3
+        uses: step-security/docker-login-action@870af644803bf9f204aed474adbad2958fec048b # v4.1.0
         with:
           registry: ${{ env.REGISTRY }}
           username: ${{ github.actor }}
@@ -38,7 +46,7 @@ jobs:
 
       - name: Extract metadata (tags, labels) for Docker
         id: meta
-        uses: docker/metadata-action@v5
+        uses: docker/metadata-action@c299e40c65443455700f0fdfc63efafe5b349051 # v5.10.0
         with:
           images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
           tags: |
@@ -48,7 +56,7 @@ jobs:
             type=semver,pattern={{major}},enable=${{ !startsWith(github.ref, 'refs/tags/v0.') }}
 
       - name: Build and push Docker image
-        uses: docker/build-push-action@v6
+        uses: step-security/docker-build-push-action@846549baaf047e867d038826129a64d81df0f704 # v7.1.0
         with:
           context: .
           platforms: linux/amd64, linux/arm64
diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 419f11b..85ef0e1 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -19,12 +19,20 @@ env:
   PRE_COMMIT_CACHE: ~/.cache/pre-commit
 
 # A workflow run is made up of one or more jobs that can run sequentially or in parallel
+permissions:
+  contents: read
+
 jobs:
   unit-tests:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v6
-      - uses: actions/setup-python@v6
+      - name: Harden the runner (Audit all outbound calls)
+        uses: step-security/harden-runner@a5ad31d6a139d249332a2605b85202e8c0b78450 # v2.19.1
+        with:
+          egress-policy: audit
+
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
+      - uses: actions/setup-python@a309ff8b426b58ec0e2a45f0f869d46889d02405 # v6.2.0
         with:
           python-version: ${{ env.DEFAULT_PYTHON }}
           cache: "pip"
@@ -33,7 +41,7 @@ jobs:
         run: pip install -r requirements-dev.txt
       - name: Restore pre-commit environment from cache
         id: cache-precommit
-        uses: actions/cache@v5.0.2
+        uses: actions/cache@8b402f58fbc84540c8b491a91e594a4576fec3d7 # v5.0.2
         with:
           path: ${{ env.PRE_COMMIT_CACHE }}
           key: >-
@@ -45,7 +53,7 @@ jobs:
         run: pre-commit run --hook-stage manual --all-files --show-diff-on-failure
       - name: Run unit-tests
         run: python -m pytest --cov --cov-config=tox.ini --cov-report=term --cov-report=html
-      - uses: actions/upload-artifact@v6
+      - uses: actions/upload-artifact@b7c566a772e6b6bfb58ed0dc250532a479d7789f # v6.0.0
         with:
           name: test-coverage
           path: htmlcov
diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
index 8b6eb79..cfbe98f 100644
--- a/.pre-commit-config.yaml
+++ b/.pre-commit-config.yaml
@@ -35,3 +35,7 @@ repos:
     rev: v1.1.406
     hooks:
       - id: pyright
+  - repo: https://github.com/gitleaks/gitleaks
+    rev: v8.16.3
+    hooks:
+      - id: gitleaks
diff --git a/Dockerfile b/Dockerfile
index e21a016..a1b3773 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,4 +1,4 @@
-FROM ghcr.io/astral-sh/uv:python3.13-alpine
+FROM ghcr.io/astral-sh/uv:python3.13-alpine@sha256:213ea9e877219e7bcb0f55070c9130c3fc84995475fca9eb8fb362916dc3f808
 
 ENV VIRT_ENV=/opt/venv
 RUN uv venv $VIRT_ENV --python 3.13