diff --git a/.github/workflows/code-scan.yml b/.github/workflows/code-scan.yml
index 8fddd15..b5052e7 100644
--- a/.github/workflows/code-scan.yml
+++ b/.github/workflows/code-scan.yml
@@ -17,12 +17,12 @@ jobs:
       contents: read
       security-events: write
     steps:
-      - uses: actions/checkout@v7
+      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
       - name: Initialize CodeQL
-        uses: github/codeql-action/init@v3
+        uses: github/codeql-action/init@ce5e7eeac396d720fe2d802714996c8ce561e311 # v3.39.0
         with:
           languages: python
       - name: Perform CodeQL analysis
-        uses: github/codeql-action/analyze@v3
+        uses: github/codeql-action/analyze@ce5e7eeac396d720fe2d802714996c8ce561e311 # v3.39.0
         with:
           category: "/language:python"
diff --git a/.github/workflows/dependency-scan.yml b/.github/workflows/dependency-scan.yml
index 8bfd058..cb2ce5f 100644
--- a/.github/workflows/dependency-scan.yml
+++ b/.github/workflows/dependency-scan.yml
@@ -18,13 +18,13 @@ jobs:
       contents: read
       pull-requests: write
     steps:
-      - uses: actions/checkout@v7
+      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
       - name: Dependency Review
-        uses: actions/dependency-review-action@v5
+        uses: actions/dependency-review-action@a1d282b36b6f3519aa1f3fc636f609c47dddb294 # v5.0.0
         with:
           fail-on-severity: high
       - name: Set up Python
-        uses: actions/setup-python@v7
+        uses: actions/setup-python@5fda3b95a4ea91299a34e894583c3862153e4b97 # v7.0.0
         with:
           python-version: "3.11"
       - name: Audit installed dependencies for known vulnerabilities
diff --git a/.github/workflows/publish.yml b/.github/workflows/publish.yml
index c8343fb..62f0276 100644
--- a/.github/workflows/publish.yml
+++ b/.github/workflows/publish.yml
@@ -4,13 +4,16 @@ on:
   release:
     types: [published]
 
+permissions:
+  contents: read
+
 jobs:
   test:
     name: Verify Tests
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v7
-      - uses: actions/setup-python@v7
+      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
+      - uses: actions/setup-python@5fda3b95a4ea91299a34e894583c3862153e4b97 # v7.0.0
         with:
           python-version: "3.11"
       - name: Install package with dev dependencies
@@ -25,8 +28,8 @@ jobs:
     needs: [test]
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v7
-      - uses: actions/setup-python@v7
+      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
+      - uses: actions/setup-python@5fda3b95a4ea91299a34e894583c3862153e4b97 # v7.0.0
         with:
           python-version: "3.11"
       - name: Install build
@@ -39,7 +42,7 @@ jobs:
           /tmp/verify-venv/bin/pip install dist/*.whl
           /tmp/verify-venv/bin/bawbel-gate --version
       - name: Store distributions
-        uses: actions/upload-artifact@v7
+        uses: actions/upload-artifact@cf430e030ddbb5b0abf93d22962f4752f3646cd9 # v7.0.2
         with:
           name: python-package-distributions
           path: dist/
@@ -55,12 +58,12 @@ jobs:
       id-token: write  # mandatory for trusted publishing; no API token stored
     steps:
       - name: Download distributions
-        uses: actions/download-artifact@v4
+        uses: actions/download-artifact@d3f86a106a0bac45b974a628896c90dbdf5c8093 # v4.3.0
         with:
           name: python-package-distributions
           path: dist/
       - name: Publish to TestPyPI
-        uses: pypa/gh-action-pypi-publish@release/v1
+        uses: pypa/gh-action-pypi-publish@dc37677b2e1c63e2034f94d8a5b11f265b73ba33 # v1.14.2
         with:
           repository-url: https://test.pypi.org/legacy/
           skip-existing: true
@@ -80,9 +83,9 @@ jobs:
       id-token: write  # mandatory for trusted publishing; no API token stored
     steps:
       - name: Download distributions
-        uses: actions/download-artifact@v4
+        uses: actions/download-artifact@d3f86a106a0bac45b974a628896c90dbdf5c8093 # v4.3.0
         with:
           name: python-package-distributions
           path: dist/
       - name: Publish to PyPI
-        uses: pypa/gh-action-pypi-publish@release/v1
+        uses: pypa/gh-action-pypi-publish@dc37677b2e1c63e2034f94d8a5b11f265b73ba33 # v1.14.2
diff --git a/.github/workflows/scorecard.yml b/.github/workflows/scorecard.yml
index f16be9f..3a5be91 100644
--- a/.github/workflows/scorecard.yml
+++ b/.github/workflows/scorecard.yml
@@ -18,25 +18,25 @@ jobs:
 
     steps:
       - name: "Checkout code"
-        uses: actions/checkout@v7
+        uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
         with:
           persist-credentials: false
 
       - name: "Run analysis"
-        uses: ossf/scorecard-action@v2.5.0
+        uses: ossf/scorecard-action@fa7117db83c52d787ae5a89f350999701505d78e # v2.5.0
         with:
           results_file: results.sarif
           results_format: sarif
           publish_results: true
 
       - name: "Upload artifact"
-        uses: actions/upload-artifact@v7
+        uses: actions/upload-artifact@cf430e030ddbb5b0abf93d22962f4752f3646cd9 # v7.0.2
         with:
           name: SARIF file
           path: results.sarif
           retention-days: 5
 
       - name: "Upload to code-scanning"
-        uses: github/codeql-action/upload-sarif@v4.38.2
+        uses: github/codeql-action/upload-sarif@2892aa5e19bbd11bc0cff5427e3b750a04d9e3c2 # v4.38.2
         with:
           sarif_file: results.sarif
diff --git a/.github/workflows/secret-scan.yml b/.github/workflows/secret-scan.yml
index 1f66eb2..3726311 100644
--- a/.github/workflows/secret-scan.yml
+++ b/.github/workflows/secret-scan.yml
@@ -16,7 +16,7 @@ jobs:
     permissions:
       contents: read
     steps:
-      - uses: actions/checkout@v7
+      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
         with:
           fetch-depth: 0
       - name: Run Gitleaks