diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index ca1b0c56..461e29a0 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -27,7 +27,7 @@ jobs:
           sudo apt-get install -y libgsl0-dev libmagick++-dev
           which gsl-config
 
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
 
       - uses: ruby/setup-ruby@v1
         with:
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index daf6ef3e..4de9cc23 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -17,7 +17,7 @@ jobs:
           sudo apt-get install -y libgsl0-dev libmagick++-dev
           which gsl-config
 
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
 
       - uses: ruby/setup-ruby@v1
         with:
@@ -45,7 +45,7 @@ jobs:
     needs: test
     steps:
       - name: Checkout
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
 
       - uses: actions/download-artifact@v6
         with:
diff --git a/.github/workflows/codeql.yml b/.github/workflows/codeql.yml
index 917fc593..7ca850f2 100644
--- a/.github/workflows/codeql.yml
+++ b/.github/workflows/codeql.yml
@@ -38,7 +38,7 @@ jobs:
 
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
 
       # Initializes the CodeQL tools for scanning.
       - name: Initialize CodeQL
diff --git a/.github/workflows/related-posts.yml b/.github/workflows/related-posts.yml
index 5b1d1eab..46708ca4 100644
--- a/.github/workflows/related-posts.yml
+++ b/.github/workflows/related-posts.yml
@@ -18,7 +18,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
 
       - name: Install vips
         run: sudo apt-get update && sudo apt-get -y install liblapacke-dev libopenblas-dev
diff --git a/.github/workflows/super-linter.yml b/.github/workflows/super-linter.yml
index 5fccc580..add35821 100644
--- a/.github/workflows/super-linter.yml
+++ b/.github/workflows/super-linter.yml
@@ -11,7 +11,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout Code
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
         with:
           fetch-depth: 0