diff --git a/.github/workflows/ci-workflow.yml b/.github/workflows/ci-workflow.yml
index 5b81368e..e55bf654 100644
--- a/.github/workflows/ci-workflow.yml
+++ b/.github/workflows/ci-workflow.yml
@@ -13,7 +13,7 @@ jobs:
   housekeeping:
     runs-on: ubuntu-24.04
     steps:
-    - uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0
+    - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1
 
     - name: Set up Python
       uses: actions/setup-python@ece7cb06caefa5fff74198d8649806c4678c61a1
@@ -54,7 +54,7 @@ jobs:
       matrix:
         python-version: [3.10.6, 3.11.2, 3.12, 3.13.5]
     steps:
-    - uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0
+    - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1
 
     - uses: actions/setup-python@ece7cb06caefa5fff74198d8649806c4678c61a1
       with:
diff --git a/.github/workflows/issue-commenter.yml b/.github/workflows/issue-commenter.yml
index 615d5e74..f4ef3263 100644
--- a/.github/workflows/issue-commenter.yml
+++ b/.github/workflows/issue-commenter.yml
@@ -9,7 +9,7 @@ jobs:
     name: Comments for every NEW issue.
     steps:
       - name: Checkout
-        uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0
+        uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1
 
       - name: Read issue-comment.md
         id: issue-comment
diff --git a/.github/workflows/test-runner.yml b/.github/workflows/test-runner.yml
index b5bac60e..44fb4ba9 100644
--- a/.github/workflows/test-runner.yml
+++ b/.github/workflows/test-runner.yml
@@ -10,6 +10,6 @@ jobs:
   test-runner:
     runs-on: ubuntu-24.04
     steps:
-      - uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0
+      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1
       - name: Run test-runner
         run: docker compose run test-runner