diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 22ff0b82..7288e091 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -26,7 +26,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
 
       - name: Set up Python
         uses: actions/setup-python@v6
@@ -52,7 +52,7 @@ jobs:
       PYTHONPATH: ${{ github.workspace }}/src
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
 
       - name: Set up Python
         uses: actions/setup-python@v6
@@ -99,7 +99,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
         with:
           fetch-depth: 0
 
@@ -120,7 +120,7 @@ jobs:
       PYTHONPATH: ${{ github.workspace }}/src
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
 
       - name: Set up Python ${{ matrix.python-version }}
         uses: actions/setup-python@v6
diff --git a/.github/workflows/code-review.yml b/.github/workflows/code-review.yml
index 11aa53c1..2f77ac98 100644
--- a/.github/workflows/code-review.yml
+++ b/.github/workflows/code-review.yml
@@ -19,7 +19,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Check out repository
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
         with:
           fetch-depth: 0
 
diff --git a/.github/workflows/codeql-analysis.yml b/.github/workflows/codeql-analysis.yml
index 80ea122d..8caee3aa 100644
--- a/.github/workflows/codeql-analysis.yml
+++ b/.github/workflows/codeql-analysis.yml
@@ -28,7 +28,7 @@ jobs:
 
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
 
       - name: Initialize CodeQL
         uses: github/codeql-action/init@v4
diff --git a/.github/workflows/copilot-setup-steps.yml b/.github/workflows/copilot-setup-steps.yml
index 22abc885..c0463ad2 100644
--- a/.github/workflows/copilot-setup-steps.yml
+++ b/.github/workflows/copilot-setup-steps.yml
@@ -20,7 +20,7 @@ jobs:
 
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
 
       - name: Set up Python
         uses: actions/setup-python@v6
diff --git a/.github/workflows/deploy-docs.yml b/.github/workflows/deploy-docs.yml
index 4e71e257..5ca439b2 100644
--- a/.github/workflows/deploy-docs.yml
+++ b/.github/workflows/deploy-docs.yml
@@ -26,7 +26,7 @@ jobs:
     
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
         with:
           fetch-depth: 0
       
diff --git a/.github/workflows/docs.yml b/.github/workflows/docs.yml
index 2d9bf923..f50ff24d 100644
--- a/.github/workflows/docs.yml
+++ b/.github/workflows/docs.yml
@@ -22,7 +22,7 @@ jobs:
       contents: write
     steps:
       - name: Checkout
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
 
       - name: Set up Python
         uses: actions/setup-python@v6
@@ -55,7 +55,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
       - name: Set up Python
         uses: actions/setup-python@v6
         with:
diff --git a/.github/workflows/lint-workflows.yml b/.github/workflows/lint-workflows.yml
index 427b589b..46b44ad9 100644
--- a/.github/workflows/lint-workflows.yml
+++ b/.github/workflows/lint-workflows.yml
@@ -26,7 +26,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Check out repository
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
 
       - name: Check for invalid bandit -f sarif usage
         run: |
diff --git a/.github/workflows/performance-regression.yml b/.github/workflows/performance-regression.yml
index f5764c8d..b066ef02 100644
--- a/.github/workflows/performance-regression.yml
+++ b/.github/workflows/performance-regression.yml
@@ -22,7 +22,7 @@ jobs:
       PYTHONPATH: ${{ github.workspace }}/src
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
 
       - name: Set up Python
         uses: actions/setup-python@v6
diff --git a/.github/workflows/pip-audit.yml b/.github/workflows/pip-audit.yml
index 438aee8b..5470299d 100644
--- a/.github/workflows/pip-audit.yml
+++ b/.github/workflows/pip-audit.yml
@@ -38,7 +38,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
 
       - name: Set up Python
         uses: actions/setup-python@v6
diff --git a/.github/workflows/pypi-zenodo.yml b/.github/workflows/pypi-zenodo.yml
index bc0f04d0..a26bb64d 100644
--- a/.github/workflows/pypi-zenodo.yml
+++ b/.github/workflows/pypi-zenodo.yml
@@ -19,7 +19,7 @@ jobs:
       id-token: write  # For trusted publishing to PyPI
     
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
       with:
         fetch-depth: 0
     
diff --git a/.github/workflows/regression-smoke.yml b/.github/workflows/regression-smoke.yml
index a08d0c7c..ed12e00c 100644
--- a/.github/workflows/regression-smoke.yml
+++ b/.github/workflows/regression-smoke.yml
@@ -13,7 +13,7 @@ jobs:
     timeout-minutes: 15
     steps:
       - name: Checkout
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
 
       - name: Set up Python
         uses: actions/setup-python@v5
diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index 696143aa..5ec01fb7 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -27,7 +27,7 @@ jobs:
       notes: ${{ steps.release_notes.outputs.notes }}
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
         with:
           fetch-depth: 0
 
@@ -128,7 +128,7 @@ jobs:
       id-token: write
     steps:
       - name: Checkout release tag
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
         with:
           fetch-depth: 0
           ref: ${{ needs.prepare.outputs.tag }}
diff --git a/.github/workflows/reproducibility.yml b/.github/workflows/reproducibility.yml
index 64379f23..e0ea0b1b 100644
--- a/.github/workflows/reproducibility.yml
+++ b/.github/workflows/reproducibility.yml
@@ -26,7 +26,7 @@ jobs:
       PYTHONPATH: ${{ github.workspace }}/src
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
 
       - name: Set up Python 3.11
         uses: actions/setup-python@v6
diff --git a/.github/workflows/sast-lint.yml b/.github/workflows/sast-lint.yml
index 7f41161c..cae06891 100644
--- a/.github/workflows/sast-lint.yml
+++ b/.github/workflows/sast-lint.yml
@@ -24,7 +24,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Check out repository
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
 
       - name: Set up Python
         uses: actions/setup-python@v6
@@ -62,7 +62,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Check out repository
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
 
       - name: Set up Python
         uses: actions/setup-python@v6
diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index 18c0e6e6..683130fe 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -11,7 +11,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
 
       - name: Set up Python
         uses: actions/setup-python@v6
diff --git a/.github/workflows/verify-references.yml b/.github/workflows/verify-references.yml
index 3c1ff866..e5bfde81 100644
--- a/.github/workflows/verify-references.yml
+++ b/.github/workflows/verify-references.yml
@@ -30,7 +30,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
         
       - name: Set up Python
         uses: actions/setup-python@v6