diff --git a/.github/workflows/ci-pr.yml b/.github/workflows/ci-pr.yml
index 8040a46..49d436a 100644
--- a/.github/workflows/ci-pr.yml
+++ b/.github/workflows/ci-pr.yml
@@ -39,7 +39,7 @@ jobs:
 
     steps:
       - name: Checkout PR branch into cwd
-        uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0
+        uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1
         with:
           # Checkout the fork/head-repository to push changes to the fork.
           # Without this the base repository will be checked out and committed to.
@@ -52,7 +52,7 @@ jobs:
           persist-credentials: true
 
       - name: Checkout main branch into directory _main_branch/
-        uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0
+        uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1
         with:
           ref: main
           path: _main_branch
@@ -63,7 +63,7 @@ jobs:
           # Be specific about keeping credentials (it is the default)
           persist-credentials: true
 
-      - uses: actions/setup-python@ece7cb06caefa5fff74198d8649806c4678c61a1
+      - uses: actions/setup-python@5fda3b95a4ea91299a34e894583c3862153e4b97
         with:
           python-version: '3.13'
 
diff --git a/.github/workflows/merge.yml b/.github/workflows/merge.yml
index 2ce349e..f7b43e8 100644
--- a/.github/workflows/merge.yml
+++ b/.github/workflows/merge.yml
@@ -39,7 +39,7 @@ jobs:
     runs-on: ubuntu-latest
     timeout-minutes: 10
     steps:
-      - uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0
+      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1
         with:
           # Using fetch-depth 0 is the only way to get all tags which are needed for building docs.
           fetch-depth: 0
@@ -47,7 +47,7 @@ jobs:
           persist-credentials: true
 
       - name: Checkout gh-pages branch to dir publish/
-        uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0
+        uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1
         with:
           ref: gh-pages
           path: publish
@@ -55,7 +55,7 @@ jobs:
           # Be specific about keeping credentials (it is the default)
           persist-credentials: true
 
-      - uses: actions/setup-python@ece7cb06caefa5fff74198d8649806c4678c61a1
+      - uses: actions/setup-python@5fda3b95a4ea91299a34e894583c3862153e4b97
         with:
           python-version: '3.13'
 
diff --git a/.github/workflows/publish.yml b/.github/workflows/publish.yml
index 359ed34..9415dd6 100644
--- a/.github/workflows/publish.yml
+++ b/.github/workflows/publish.yml
@@ -35,7 +35,7 @@ jobs:
     runs-on: ubuntu-latest
     timeout-minutes: 10
     steps:
-      - uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0
+      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1
         with:
           # Using fetch-depth 0 is the only way to get all tags which are needed for building docs.
           fetch-depth: 0
@@ -43,7 +43,7 @@ jobs:
           persist-credentials: true
 
       - name: Checkout gh-pages branch to dir publish/
-        uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0
+        uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1
         with:
           ref: gh-pages
           path: publish
@@ -51,7 +51,7 @@ jobs:
           # Be specific about keeping credentials (it is the default)
           persist-credentials: true
 
-      - uses: actions/setup-python@ece7cb06caefa5fff74198d8649806c4678c61a1
+      - uses: actions/setup-python@5fda3b95a4ea91299a34e894583c3862153e4b97
         with:
           python-version: '3.13'