diff --git a/.github/workflows/apihome.yml b/.github/workflows/apihome.yml
index f7baa37..a89ae53 100644
--- a/.github/workflows/apihome.yml
+++ b/.github/workflows/apihome.yml
@@ -14,7 +14,7 @@ jobs:
 
     steps:
       - name: Checkout
-        uses: actions/checkout@v2
+        uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd
 
       - name: SCP files to production system
         uses: appleboy/scp-action@ff85246acaad7bdce478db94a363cd2bf7c90345
diff --git a/.github/workflows/docshome.yml b/.github/workflows/docshome.yml
index 4c9ad05..1f56e33 100644
--- a/.github/workflows/docshome.yml
+++ b/.github/workflows/docshome.yml
@@ -14,7 +14,7 @@ jobs:
 
     steps:
       - name: Checkout
-        uses: actions/checkout@v4
+        uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd
 
       - name: SCP files to production system
         uses: appleboy/scp-action@ff85246acaad7bdce478db94a363cd2bf7c90345
diff --git a/.github/workflows/test-documentation.yml b/.github/workflows/test-documentation.yml
index 10cc6d5..e54ed1c 100644
--- a/.github/workflows/test-documentation.yml
+++ b/.github/workflows/test-documentation.yml
@@ -8,7 +8,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout
-        uses: actions/checkout@v4
+        uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd
 
       - name: Test if the documentation will render without warnings
         run: |