diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index ae0e173..f48691c 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -29,7 +29,7 @@ jobs:
             julia-version: '1.9'
 
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
 
       - name: Setup Julia
         uses: julia-actions/setup-julia@v2
@@ -57,7 +57,7 @@ jobs:
     name: SPDX & Documentation Check
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
 
       - name: Check SPDX headers
         run: |
@@ -96,7 +96,7 @@ jobs:
     permissions:
       security-events: write
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
 
       - name: Check for secrets
         uses: trufflesecurity/trufflehog@main
diff --git a/.github/workflows/codeql.yml b/.github/workflows/codeql.yml
index 2c69e83..f08d6bd 100644
--- a/.github/workflows/codeql.yml
+++ b/.github/workflows/codeql.yml
@@ -23,7 +23,7 @@ jobs:
 
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
 
       # Note: CodeQL doesn't have native Julia support
       # We use custom queries for security patterns