diff --git a/.github/workflows/check_doxygen_awesome_version.yml b/.github/workflows/check_doxygen_awesome_version.yml
index 515b7e1..84f459d 100644
--- a/.github/workflows/check_doxygen_awesome_version.yml
+++ b/.github/workflows/check_doxygen_awesome_version.yml
@@ -21,7 +21,7 @@ jobs:
       GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
 
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - name: Open PR if doxygen-awesome outdated.
         run: |
 
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index cfffd6c..c05ab47 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -62,7 +62,7 @@ jobs:
               flags: '-DHIGHFIVE_TEST_BOOST=Off -DCMAKE_CXX_STANDARD=20'
 
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
       with:
         submodules: true
 
@@ -104,7 +104,7 @@ jobs:
         hdf5_version : [ hdf5-1_8_23, hdf5-1_10_11, hdf5-1_12_3, hdf5_1.14.6, hdf5_2.0.0]
 
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
       with:
         submodules: true
     - name: "Install libraries"
@@ -165,7 +165,7 @@ jobs:
 
 
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
       with:
         submodules: true
 
@@ -203,7 +203,7 @@ jobs:
       CXX: clang++-21
 
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
       with:
         submodules: true
 
@@ -254,7 +254,7 @@ jobs:
         ]
 
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
       with:
         submodules: true
 
@@ -299,7 +299,7 @@ jobs:
       matrix:
         parallelism: [ serial, parallel ]
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
       with:
         submodules: true
 
@@ -340,7 +340,7 @@ jobs:
             cxxstd: "14"
 
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
       with:
         submodules: true
 
@@ -392,7 +392,7 @@ jobs:
         cxxstd: ["14", "17", "20"]
 
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
       with:
         submodules: true
 
diff --git a/.github/workflows/clang_format.yml b/.github/workflows/clang_format.yml
index 9a1a6bc..1fc8671 100644
--- a/.github/workflows/clang_format.yml
+++ b/.github/workflows/clang_format.yml
@@ -19,7 +19,7 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
 
     - name: Run clang-format
       run: |
diff --git a/.github/workflows/coverage.yml b/.github/workflows/coverage.yml
index dd208a7..3bec8b6 100644
--- a/.github/workflows/coverage.yml
+++ b/.github/workflows/coverage.yml
@@ -40,7 +40,7 @@ jobs:
         sudo apt-get install libhdf5-dev libsz2 libboost-all-dev libeigen3-dev libopencv-dev
         sudo apt-get install libxtensor-dev
 
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
       with:
         fetch-depth: 1
         submodules: true
diff --git a/.github/workflows/gh-pages.yml b/.github/workflows/gh-pages.yml
index 7a4913b..8ec57c0 100644
--- a/.github/workflows/gh-pages.yml
+++ b/.github/workflows/gh-pages.yml
@@ -29,7 +29,7 @@ jobs:
 
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
         with:
           submodules: 'recursive'
           fetch-depth: 0
diff --git a/.github/workflows/version_file.yml b/.github/workflows/version_file.yml
index d60a9b6..f554df6 100644
--- a/.github/workflows/version_file.yml
+++ b/.github/workflows/version_file.yml
@@ -20,7 +20,7 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
       with:
         submodules: true