diff --git a/.github/dependabot.yml b/.github/dependabot.yml
new file mode 100644
index 0000000..365eeec
--- /dev/null
+++ b/.github/dependabot.yml
@@ -0,0 +1,11 @@
+version: 2
+updates:
+  - package-ecosystem: github-actions
+    directory: /
+    schedule:
+      interval: daily
+
+  - package-ecosystem: docker
+    directory: /
+    schedule:
+      interval: daily
diff --git a/.github/workflows/ci.yaml b/.github/workflows/ci.yaml
index efefada..580cab9 100644
--- a/.github/workflows/ci.yaml
+++ b/.github/workflows/ci.yaml
@@ -5,11 +5,20 @@ on:
     branches:
       - '**'
 
+permissions: {}
+
 jobs:
   test:
+    permissions:
+      contents: read  # for actions/checkout to fetch code
     runs-on: ubuntu-latest
     if: github.event_name == 'push' && !contains(toJson(github.event.commits), '[ci skip]') && !contains(toJson(github.event.commits), '[skip ci]')
     steps:
+      - name: Harden the runner (Audit all outbound calls)
+        uses: step-security/harden-runner@f4a75cfd619ee5ce8d5b864b0d183aff3c69b55a # v2.13.1
+        with:
+          egress-policy: audit
+
       - uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8 # v5
       - run: make lint
       - run: make test
diff --git a/.github/workflows/dependency-review.yml b/.github/workflows/dependency-review.yml
new file mode 100644
index 0000000..98a2a20
--- /dev/null
+++ b/.github/workflows/dependency-review.yml
@@ -0,0 +1,27 @@
+# Dependency Review Action
+#
+# This Action will scan dependency manifest files that change as part of a Pull Request,
+# surfacing known-vulnerable versions of the packages declared or updated in the PR.
+# Once installed, if the workflow run is marked as required,
+# PRs introducing known-vulnerable packages will be blocked from merging.
+#
+# Source repository: https://github.com/actions/dependency-review-action
+name: 'Dependency Review'
+on: [pull_request]
+
+permissions:
+  contents: read
+
+jobs:
+  dependency-review:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Harden the runner (Audit all outbound calls)
+        uses: step-security/harden-runner@f4a75cfd619ee5ce8d5b864b0d183aff3c69b55a # v2.13.1
+        with:
+          egress-policy: audit
+
+      - name: 'Checkout Repository'
+        uses: actions/checkout@08eba0b27e820071cde6df949e0beb9ba4906955 # v4.3.0
+      - name: 'Dependency Review'
+        uses: actions/dependency-review-action@595b5aeba73380359d98a5e087f648dbb0edce1b # v4.7.3
diff --git a/.github/workflows/docker.yaml b/.github/workflows/docker.yaml
index 6e91af9..47c6183 100644
--- a/.github/workflows/docker.yaml
+++ b/.github/workflows/docker.yaml
@@ -18,12 +18,12 @@ jobs:
         if: startsWith(github.event.inputs.release_tag, 'v')
         steps:
         - name: Harden the runner (Audit all outbound calls)
-          uses: step-security/harden-runner@v2
+          uses: step-security/harden-runner@f4a75cfd619ee5ce8d5b864b0d183aff3c69b55a # v2.13.1
           with:
             egress-policy: audit
 
         - name: Checkout
-          uses: actions/checkout@v5
+          uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8 # v5.0.0
         - name: Validate tag format
           run: |
             TAG=${{ github.event.inputs.release_tag }}
@@ -33,20 +33,20 @@ jobs:
             fi
             echo "✅ Valid semver tag: $TAG"
         - name: Log in to GitHub Container Registry
-          uses: docker/login-action@v3
+          uses: docker/login-action@184bdaa0721073962dff0199f1fb9940f07167d1 # v3.5.0
           with:
             registry: ghcr.io
             username: ${{ github.actor }}
             password: ${{ secrets.GITHUB_TOKEN }}
 
         - name: Set up QEMU for ARM builds
-          uses: docker/setup-qemu-action@v3
+          uses: docker/setup-qemu-action@29109295f81e9208d7d86ff1c6c12d2833863392 # v3.6.0
 
         - name: Set up Docker Buildx
-          uses: docker/setup-buildx-action@v3
+          uses: docker/setup-buildx-action@e468171a9de216ec08956ac3ada2f0791b6bd435 # v3.11.1
 
         - name: Build and push Docker image
-          uses: docker/build-push-action@v6
+          uses: docker/build-push-action@263435318d21b8e681c14492fe198d362a7d2c83 # v6.18.0
           with:
             context: .
             push: true
diff --git a/.github/workflows/scorecards.yml b/.github/workflows/scorecards.yml
new file mode 100644
index 0000000..8bf1735
--- /dev/null
+++ b/.github/workflows/scorecards.yml
@@ -0,0 +1,81 @@
+# This workflow uses actions that are not certified by GitHub. They are provided
+# by a third-party and are governed by separate terms of service, privacy
+# policy, and support documentation.
+
+name: Scorecard supply-chain security
+on:
+  # For Branch-Protection check. Only the default branch is supported. See
+  # https://github.com/ossf/scorecard/blob/main/docs/checks.md#branch-protection
+  branch_protection_rule:
+  # To guarantee Maintained check is occasionally updated. See
+  # https://github.com/ossf/scorecard/blob/main/docs/checks.md#maintained
+  schedule:
+    - cron: '20 7 * * 2'
+  push:
+    branches: ["main"]
+
+# Declare default permissions as read only.
+permissions: read-all
+
+jobs:
+  analysis:
+    name: Scorecard analysis
+    runs-on: ubuntu-latest
+    permissions:
+      # Needed to upload the results to code-scanning dashboard.
+      security-events: write
+      # Needed to publish results and get a badge (see publish_results below).
+      id-token: write
+      contents: read
+      actions: read
+      # To allow GraphQL ListCommits to work
+      issues: read
+      pull-requests: read
+      # To detect SAST tools
+      checks: read
+
+    steps:
+      - name: Harden the runner (Audit all outbound calls)
+        uses: step-security/harden-runner@f4a75cfd619ee5ce8d5b864b0d183aff3c69b55a # v2.13.1
+        with:
+          egress-policy: audit
+
+      - name: "Checkout code"
+        uses: actions/checkout@08eba0b27e820071cde6df949e0beb9ba4906955 # v4.3.0
+        with:
+          persist-credentials: false
+
+      - name: "Run analysis"
+        uses: ossf/scorecard-action@62b2cac7ed8198b15735ed49ab1e5cf35480ba46 # v2.4.0
+        with:
+          results_file: results.sarif
+          results_format: sarif
+          # (Optional) "write" PAT token. Uncomment the `repo_token` line below if:
+          # - you want to enable the Branch-Protection check on a *public* repository, or
+          # - you are installing Scorecards on a *private* repository
+          # To create the PAT, follow the steps in https://github.com/ossf/scorecard-action#authentication-with-pat.
+          # repo_token: ${{ secrets.SCORECARD_TOKEN }}
+
+          # Public repositories:
+          #   - Publish results to OpenSSF REST API for easy access by consumers
+          #   - Allows the repository to include the Scorecard badge.
+          #   - See https://github.com/ossf/scorecard-action#publishing-results.
+          # For private repositories:
+          #   - `publish_results` will always be set to `false`, regardless
+          #     of the value entered here.
+          publish_results: true
+
+      # Upload the results as artifacts (optional). Commenting out will disable uploads of run results in SARIF
+      # format to the repository Actions tab.
+      - name: "Upload artifact"
+        uses: actions/upload-artifact@ea165f8d65b6e75b540449e92b4886f43607fa02 # v4.6.2
+        with:
+          name: SARIF file
+          path: results.sarif
+          retention-days: 5
+
+      # Upload the results to GitHub's code scanning dashboard.
+      - name: "Upload to code-scanning"
+        uses: github/codeql-action/upload-sarif@192325c86100d080feab897ff886c34abd4c83a3 # v3.30.3
+        with:
+          sarif_file: results.sarif
diff --git a/Dockerfile b/Dockerfile
index 403c9c6..4b64887 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,4 +1,4 @@
-FROM golang:1.25-alpine3.22
+FROM golang:1.25-alpine3.22@sha256:b6ed3fd0452c0e9bcdef5597f29cc1418f61672e9d3a2f55bf02e7222c014abd
 
 ARG GHCOMMIT_VERSION=v0.1.75