diff --git a/.github/workflows/codeql.yml b/.github/workflows/codeql.yml
index e92a5e3..e56ad73 100644
--- a/.github/workflows/codeql.yml
+++ b/.github/workflows/codeql.yml
@@ -39,7 +39,7 @@ jobs:
           build-mode: none
     steps:
     - name: Checkout repository
-      uses: actions/checkout@v4
+      uses: actions/checkout@v6
 
     - name: Initialize CodeQL
       uses: github/codeql-action/init@v3
diff --git a/.github/workflows/mdbook-fixed.yml b/.github/workflows/mdbook-fixed.yml
index 851fd1e..d7b9582 100644
--- a/.github/workflows/mdbook-fixed.yml
+++ b/.github/workflows/mdbook-fixed.yml
@@ -19,7 +19,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
 
       - name: Install mdBook
         run: |
diff --git a/.github/workflows/mdbook-simple.yml b/.github/workflows/mdbook-simple.yml
index 851fd1e..d7b9582 100644
--- a/.github/workflows/mdbook-simple.yml
+++ b/.github/workflows/mdbook-simple.yml
@@ -19,7 +19,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
 
       - name: Install mdBook
         run: |
diff --git a/.github/workflows/mdbook.yml b/.github/workflows/mdbook.yml
index 8bfc5a6..e0e9a32 100644
--- a/.github/workflows/mdbook.yml
+++ b/.github/workflows/mdbook.yml
@@ -19,7 +19,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
 
       - name: Install mdBook
         run: |