diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 5e0c661..e7b99bc 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -15,7 +15,7 @@ jobs:
     name: Lint & Format
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
       - uses: actions/setup-python@v5
         with:
           python-version: "3.11"
@@ -37,7 +37,7 @@ jobs:
     name: Type Check
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
       - uses: actions/setup-python@v5
         with:
           python-version: "3.11"
@@ -58,7 +58,7 @@ jobs:
         python-version: ["3.10", "3.11", "3.12"]
         os: [ubuntu-latest, macos-latest]
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
       - uses: actions/setup-python@v5
         with:
           python-version: ${{ matrix.python-version }}
@@ -87,7 +87,7 @@ jobs:
     runs-on: ubuntu-latest
     needs: [lint, test]
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
       - uses: actions/setup-python@v5
         with:
           python-version: "3.11"
diff --git a/.github/workflows/security.yml b/.github/workflows/security.yml
index f5faa88..8e74044 100644
--- a/.github/workflows/security.yml
+++ b/.github/workflows/security.yml
@@ -17,7 +17,7 @@ jobs:
     name: Bandit (SAST)
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
       - uses: actions/setup-python@v5
         with:
           python-version: "3.11"
@@ -32,7 +32,7 @@ jobs:
     name: pip-audit (Dependencies)
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
       - uses: actions/setup-python@v5
         with:
           python-version: "3.11"
@@ -45,7 +45,7 @@ jobs:
     name: Safety (CVE Database)
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
       - uses: actions/setup-python@v5
       - run: pipx install poetry==1.8.0
       - run: pip install safety
@@ -59,7 +59,7 @@ jobs:
       security-events: write
       contents: read
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
       - uses: github/codeql-action/init@v3
         with:
           languages: python
@@ -70,7 +70,7 @@ jobs:
     name: Secret Scanning (Gitleaks)
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
         with:
           fetch-depth: 0
       - uses: gitleaks/gitleaks-action@v2