diff --git a/.github/workflows/cd_container_image.yml b/.github/workflows/cd_container_image.yml
index 12e208fb4..4506ce917 100644
--- a/.github/workflows/cd_container_image.yml
+++ b/.github/workflows/cd_container_image.yml
@@ -26,7 +26,7 @@ jobs:
 
     steps:
     - name: Checkout repository
-      uses: actions/checkout@v5
+      uses: actions/checkout@v6
       with:
         fetch-depth: 0
         submodules: true
diff --git a/.github/workflows/cd_release.yml b/.github/workflows/cd_release.yml
index 16aaf3fc2..c0ea5abec 100644
--- a/.github/workflows/cd_release.yml
+++ b/.github/workflows/cd_release.yml
@@ -38,7 +38,7 @@ jobs:
         echo 'publish_branch=${{ fromJson(steps.get_release_branch.outputs.data).target_commitish }}' >> $GITHUB_OUTPUT
 
     - name: Checkout publish branch
-      uses: actions/checkout@v5
+      uses: actions/checkout@v6
       with:
         submodules: true
         fetch-depth: 0
@@ -117,7 +117,7 @@ jobs:
       run: python -m pip install build
 
     - name: Checkout repository
-      uses: actions/checkout@v5
+      uses: actions/checkout@v6
       with:
         submodules: true
         fetch-depth: 0
@@ -140,7 +140,7 @@ jobs:
 
     steps:
     - name: Checkout repository
-      uses: actions/checkout@v5
+      uses: actions/checkout@v6
       with:
         submodules: true
         fetch-depth: 0
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 4398a990b..66f5ea8f7 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -23,7 +23,7 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
       with:
         submodules: true
 
@@ -49,7 +49,7 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
       with:
         submodules: true
 
@@ -80,7 +80,7 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
       with:
         submodules: true
 
@@ -156,7 +156,7 @@ jobs:
 
 
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
       with:
         submodules: true
         fetch-depth: 2
@@ -274,7 +274,7 @@ jobs:
 
     - name: Upload coverage to Codecov
       if: matrix.python-version == '3.11' && github.repository == 'Materials-Consortia/optimade-python-tools'
-      uses: codecov/codecov-action@v5
+      uses: codecov/codecov-action@v6
       with:
         token: ${{ secrets.CODECOV_TOKEN }}
         name: project
@@ -283,7 +283,7 @@ jobs:
 
     - name: Upload validator coverage to Codecov
       if: matrix.python-version == '3.11' && github.repository == 'Materials-Consortia/optimade-python-tools'
-      uses: codecov/codecov-action@v5
+      uses: codecov/codecov-action@v6
       with:
         token: ${{ secrets.CODECOV_TOKEN }}
         name: validator
@@ -294,7 +294,7 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
       with:
         submodules: true
 
@@ -324,7 +324,7 @@ jobs:
 
     steps:
     - name: Checkout repository
-      uses: actions/checkout@v5
+      uses: actions/checkout@v6
 
     - name: Set up Python ${{ env.LINTING_PY_VERSION }}
       uses: actions/setup-python@v6
diff --git a/.github/workflows/ci_cd_updated_main.yml b/.github/workflows/ci_cd_updated_main.yml
index 5094d2f79..ceee114a2 100644
--- a/.github/workflows/ci_cd_updated_main.yml
+++ b/.github/workflows/ci_cd_updated_main.yml
@@ -37,7 +37,7 @@ jobs:
 
     - name: Checkout repository
       if: steps.release_check.outputs.release_run == 'false'
-      uses: actions/checkout@v5
+      uses: actions/checkout@v6
       with:
         fetch-depth: 0
         submodules: true
@@ -103,7 +103,7 @@ jobs:
 
     steps:
     - name: Checkout repository
-      uses: actions/checkout@v5
+      uses: actions/checkout@v6
       with:
         fetch-depth: 0
         submodules: true