diff --git a/.github/workflows/ci-cd.yml b/.github/workflows/ci-cd.yml
index c48a485..f25362c 100644
--- a/.github/workflows/ci-cd.yml
+++ b/.github/workflows/ci-cd.yml
@@ -22,12 +22,12 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout code
-        uses: actions/checkout@v4
+        uses: actions/checkout@34e114876b0b11c390a56381ad16ebd13914f8d5 # v4
         with:
           fetch-depth: 0  # Full history for SonarCloud
 
       - name: Set up Julia
-        uses: julia-actions/setup-julia@v1
+        uses: julia-actions/setup-julia@ac0d62164df5a47de404f4e96ce86a1a28a28d56 # v1
         with:
           version: ${{ env.JULIA_VERSION }}
 
@@ -58,10 +58,10 @@ jobs:
       contents: read
     steps:
       - name: Checkout code
-        uses: actions/checkout@v4
+        uses: actions/checkout@34e114876b0b11c390a56381ad16ebd13914f8d5 # v4
 
       - name: Run GitLeaks (secrets detection)
-        uses: gitleaks/gitleaks-action@v2
+        uses: gitleaks/gitleaks-action@ff98106e4c7b2bc287b24eaf42907196329070c7 # v2
         env:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
           GITLEAKS_LICENSE: ${{ secrets.GITLEAKS_LICENSE }}
@@ -85,7 +85,7 @@ jobs:
           category: 'trivy-filesystem'
 
       - name: Run Snyk security scan
-        uses: snyk/actions/node@master
+        uses: snyk/actions/node@9adf32b1121593767fc3c057af55b55db032dc04 # v1.0.0
         continue-on-error: true
         env:
           SNYK_TOKEN: ${{ secrets.SNYK_TOKEN }}
@@ -93,7 +93,7 @@ jobs:
           args: --severity-threshold=high
 
       - name: OWASP Dependency Check
-        uses: dependency-check/Dependency-Check_Action@main
+        uses: dependency-check/Dependency-Check_Action@2ba636726705b0f74f126ebeaacaf2ad4600b967 # main
         with:
           project: 'robot-vacuum-cleaner'
           path: '.'
@@ -102,7 +102,7 @@ jobs:
         continue-on-error: true
 
       - name: Upload dependency check report
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@ea165f8d65b6e75b540449e92b4886f43607fa02 # v4
         if: always()
         with:
           name: dependency-check-report
@@ -117,10 +117,10 @@ jobs:
         julia-version: ['1.9', '1.10', 'nightly']
     steps:
       - name: Checkout code
-        uses: actions/checkout@v4
+        uses: actions/checkout@34e114876b0b11c390a56381ad16ebd13914f8d5 # v4
 
       - name: Set up Julia ${{ matrix.julia-version }}
-        uses: julia-actions/setup-julia@v1
+        uses: julia-actions/setup-julia@ac0d62164df5a47de404f4e96ce86a1a28a28d56 # v1
         with:
           version: ${{ matrix.julia-version }}
 
@@ -135,12 +135,12 @@ jobs:
           julia --project=. -e 'using Pkg; Pkg.test(coverage=true)'
 
       - name: Process coverage
-        uses: julia-actions/julia-processcoverage@v1
+        uses: julia-actions/julia-processcoverage@03114f09f119417c3242a9fb6e0b722676aedf38 # v1
         with:
           directories: src/julia/RobotVacuum/src
 
       - name: Upload coverage to Codecov
-        uses: codecov/codecov-action@v4
+        uses: codecov/codecov-action@b9fd7d16f6d7d1b5d2bec1a2887e65ceed900238 # v4
         with:
           files: lcov.info
           flags: julia-${{ matrix.julia-version }}
@@ -153,10 +153,10 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout code
-        uses: actions/checkout@v4
+        uses: actions/checkout@34e114876b0b11c390a56381ad16ebd13914f8d5 # v4
 
       - name: Install Rust toolchain
-        uses: actions-rust-lang/setup-rust-toolchain@v1
+        uses: actions-rust-lang/setup-rust-toolchain@1780873c7b576612439a134613cc4cc74ce5538c # v1
         with:
           toolchain: ${{ env.RUST_VERSION }}
           components: rustfmt, clippy
@@ -183,7 +183,7 @@ jobs:
         continue-on-error: true
 
       - name: Upload Rust coverage
-        uses: codecov/codecov-action@v4
+        uses: codecov/codecov-action@b9fd7d16f6d7d1b5d2bec1a2887e65ceed900238 # v4
         with:
           file: src/rust/coverage/cobertura.xml
           flags: rust
@@ -202,14 +202,14 @@ jobs:
       security-events: write
     steps:
       - name: Checkout code
-        uses: actions/checkout@v4
+        uses: actions/checkout@34e114876b0b11c390a56381ad16ebd13914f8d5 # v4
 
       - name: Set up Docker Buildx
-        uses: docker/setup-buildx-action@v3
+        uses: docker/setup-buildx-action@e468171a9de216ec08956ac3ada2f0791b6bd435 # v3
 
       - name: Log in to Container Registry
         if: github.event_name != 'pull_request'
-        uses: docker/login-action@v3
+        uses: docker/login-action@5e57cd118135c172c3672efd75eb46360885c0ef # v3
         with:
           registry: ${{ env.REGISTRY }}
           username: ${{ github.actor }}
@@ -217,7 +217,7 @@ jobs:
 
       - name: Extract metadata
         id: meta
-        uses: docker/metadata-action@v5
+        uses: docker/metadata-action@c299e40c65443455700f0fdfc63efafe5b349051 # v5
         with:
           images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
           tags: |
@@ -229,7 +229,7 @@ jobs:
             type=raw,value=latest,enable={{is_default_branch}}
 
       - name: Build container image
-        uses: docker/build-push-action@v5
+        uses: docker/build-push-action@ca052bb54ab0790a636c9b5f226502c73d547a25 # v5
         with:
           context: .
           file: ./docker/Containerfile
@@ -258,13 +258,13 @@ jobs:
           category: 'trivy-container'
 
       - name: Run Hadolint (Dockerfile linting)
-        uses: hadolint/hadolint-action@v3.1.0
+        uses: hadolint/hadolint-action@54c9adbab1582c2ef04b2016b760714a4bfde3cf # v3.1.0
         with:
           dockerfile: docker/Containerfile
           failure-threshold: warning
 
       - name: Scan with Grype
-        uses: anchore/scan-action@v3
+        uses: anchore/scan-action@3343887d815d7b07465f6fdcd395bd66508d486a # v3
         with:
           image: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}:${{ steps.meta.outputs.version }}
           fail-build: false
@@ -272,7 +272,7 @@ jobs:
 
       - name: Push container image
         if: github.event_name != 'pull_request'
-        uses: docker/build-push-action@v5
+        uses: docker/build-push-action@ca052bb54ab0790a636c9b5f226502c73d547a25 # v5
         with:
           context: .
           file: ./docker/Containerfile
@@ -287,18 +287,18 @@ jobs:
     needs: [test-julia]
     steps:
       - name: Checkout code
-        uses: actions/checkout@v4
+        uses: actions/checkout@34e114876b0b11c390a56381ad16ebd13914f8d5 # v4
         with:
           fetch-depth: 0
 
       - name: Download Julia coverage
-        uses: actions/download-artifact@v4
+        uses: actions/download-artifact@d3f86a106a0bac45b974a628896c90dbdf5c8093 # v4
         with:
           name: julia-coverage
           path: htmlcov/
 
       - name: SonarCloud Scan
-        uses: SonarSource/sonarcloud-github-action@master
+        uses: SonarSource/sonarcloud-github-action@ffc3010689be73b8e5ae0c57ce35968afd7909e8 # v5.0.0
         env:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
           SONAR_TOKEN: ${{ secrets.SONAR_TOKEN }}
@@ -343,10 +343,10 @@ jobs:
 
     steps:
       - name: Checkout code
-        uses: actions/checkout@v4
+        uses: actions/checkout@34e114876b0b11c390a56381ad16ebd13914f8d5 # v4
 
       - name: Set up Julia
-        uses: julia-actions/setup-julia@v1
+        uses: julia-actions/setup-julia@ac0d62164df5a47de404f4e96ce86a1a28a28d56 # v1
         with:
           version: ${{ env.JULIA_VERSION }}
 
@@ -377,7 +377,7 @@ jobs:
       url: https://robot-vacuum.example.com
     steps:
       - name: Checkout code
-        uses: actions/checkout@v4
+        uses: actions/checkout@34e114876b0b11c390a56381ad16ebd13914f8d5 # v4
 
       - name: Deploy to production
         run: |
@@ -386,7 +386,7 @@ jobs:
           # e.g., kubectl apply, helm upgrade, etc.
 
       - name: Notify deployment
-        uses: 8398a7/action-slack@v3
+        uses: 8398a7/action-slack@77eaa4f1c608a7d68b38af4e3f739dcd8cba273e # v3
         if: always()
         with:
           status: ${{ job.status }}
diff --git a/.github/workflows/codeql.yml b/.github/workflows/codeql.yml
index a19c1fe..7593be6 100644
--- a/.github/workflows/codeql.yml
+++ b/.github/workflows/codeql.yml
@@ -57,7 +57,7 @@ jobs:
         # your codebase is analyzed, see https://docs.github.com/en/code-security/code-scanning/creating-an-advanced-setup-for-code-scanning/codeql-code-scanning-for-compiled-languages
     steps:
     - name: Checkout repository
-      uses: actions/checkout@v4
+      uses: actions/checkout@34e114876b0b11c390a56381ad16ebd13914f8d5 # v4
 
     # Add any setup steps before running the `github/codeql-action/init` action.
     # This includes steps like installing compilers or runtimes (`actions/setup-node`
@@ -67,7 +67,7 @@ jobs:
 
     # Initializes the CodeQL tools for scanning.
     - name: Initialize CodeQL
-      uses: github/codeql-action/init@v4
+      uses: github/codeql-action/init@cf1bb45a277cb3c205638b2cd5c984db1c46a412 # v4
       with:
         languages: ${{ matrix.language }}
         build-mode: ${{ matrix.build-mode }}
@@ -96,6 +96,6 @@ jobs:
         exit 1
 
     - name: Perform CodeQL Analysis
-      uses: github/codeql-action/analyze@v4
+      uses: github/codeql-action/analyze@cf1bb45a277cb3c205638b2cd5c984db1c46a412 # v4
       with:
         category: "/language:${{matrix.language}}"
diff --git a/.github/workflows/jekyll-gh-pages.yml b/.github/workflows/jekyll-gh-pages.yml
index e31d81c..d6771fd 100644
--- a/.github/workflows/jekyll-gh-pages.yml
+++ b/.github/workflows/jekyll-gh-pages.yml
@@ -27,16 +27,16 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout
-        uses: actions/checkout@v4
+        uses: actions/checkout@34e114876b0b11c390a56381ad16ebd13914f8d5 # v4
       - name: Setup Pages
-        uses: actions/configure-pages@v5
+        uses: actions/configure-pages@983d7736d9b0ae728b81ab479565c72886d7745b # v5
       - name: Build with Jekyll
-        uses: actions/jekyll-build-pages@v1
+        uses: actions/jekyll-build-pages@44a6e6beabd48582f863aeeb6cb2151cc1716697 # v1
         with:
           source: ./
           destination: ./_site
       - name: Upload artifact
-        uses: actions/upload-pages-artifact@v3
+        uses: actions/upload-pages-artifact@56afc609e74202658d3ffba0e8f6dda462b719fa # v3
 
   # Deployment job
   deploy:
@@ -48,4 +48,4 @@ jobs:
     steps:
       - name: Deploy to GitHub Pages
         id: deployment
-        uses: actions/deploy-pages@v4
+        uses: actions/deploy-pages@d6db90164ac5ed86f2b6aed7e0febac5b3c0c03e # v4