diff --git a/.github/workflows/ci_publish.yml b/.github/workflows/ci_publish.yml
index 62bae281..d4303379 100644
--- a/.github/workflows/ci_publish.yml
+++ b/.github/workflows/ci_publish.yml
@@ -25,10 +25,10 @@ jobs:
     name: Publish HTML
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@1af3b93b6815bc44a9784bd300feb67ff0d1eeb3  # v6.0.0
 
       - name: Setup Python
-        uses: actions/setup-python@v6
+        uses: actions/setup-python@83679a892e2d95755f2dac6acb0bfd1e9ac5d548  # v6.1.0
         with:
           python-version: '3.12'
 
@@ -51,7 +51,7 @@ jobs:
     runs-on: ubuntu-latest
     needs: publish_html
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@1af3b93b6815bc44a9784bd300feb67ff0d1eeb3  # v6.0.0
 
       - name: Deploy to deployed_notebooks branch
         run: |
diff --git a/.github/workflows/ci_tests_run_notebooks.yml b/.github/workflows/ci_tests_run_notebooks.yml
index c1c5fd57..6ed08168 100644
--- a/.github/workflows/ci_tests_run_notebooks.yml
+++ b/.github/workflows/ci_tests_run_notebooks.yml
@@ -41,17 +41,17 @@ jobs:
             os: ubuntu-latest
 
     steps:
-    - uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8  # v5.0.0
-    - name: Set up Python ${{ matrix.python-version }}
-      uses: actions/setup-python@2e3e4b15a884dc73a63f962bff250a855150a234  #v5.1.0
-      with:
-        python-version: ${{ matrix.python-version }}
+      - uses: actions/checkout@1af3b93b6815bc44a9784bd300feb67ff0d1eeb3  # v6.0.0
+      - name: Set up Python ${{ matrix.python-version }}
+        uses: actions/setup-python@83679a892e2d95755f2dac6acb0bfd1e9ac5d548  # v6.1.0
+        with:
+          python-version: ${{ matrix.python-version }}
 
-    - name: Install dependencies
-      run: python -m pip install --upgrade tox
+      - name: Install dependencies
+        run: python -m pip install --upgrade tox
 
-    - name: Test with tox
-      run: tox ${{ matrix.toxargs }} -e ${{ matrix.toxenv }} -- ${{ matrix.toxposargs }}
+      - name: Test with tox
+        run: tox ${{ matrix.toxargs }} -e ${{ matrix.toxenv }} -- ${{ matrix.toxposargs }}
 
 
   gha_buildhtml:
@@ -61,10 +61,10 @@ jobs:
     name: Buildhtml testing
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@1af3b93b6815bc44a9784bd300feb67ff0d1eeb3  # v6.0.0
 
       - name: Setup Python
-        uses: actions/setup-python@v6
+        uses: actions/setup-python@83679a892e2d95755f2dac6acb0bfd1e9ac5d548  # v6.1.0
         with:
           python-version: '3.12'