diff --git a/.github/workflows/ci-pr.yml b/.github/workflows/ci-pr.yml
index 7681fd0..bd00bfd 100644
--- a/.github/workflows/ci-pr.yml
+++ b/.github/workflows/ci-pr.yml
@@ -30,7 +30,7 @@ jobs:
 
     steps:
       - name: Checkout PR branch into cwd
-        uses: actions/checkout@eef61447b9ff4aafe5dcd4e0bbf5d482be7e7871
+        uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683
         with:
           # Checkout the fork/head-repository to push changes to the fork.
           # Without this the base repository will be checked out and committed to.
@@ -40,7 +40,7 @@ jobs:
           ref: ${{ github.head_ref }}
 
       - name: Checkout main branch into directory _main_branch/
-        uses: actions/checkout@eef61447b9ff4aafe5dcd4e0bbf5d482be7e7871
+        uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683
         with:
           ref: main
           path: _main_branch
diff --git a/.github/workflows/merge.yml b/.github/workflows/merge.yml
index ed5cfdd..48bdf28 100644
--- a/.github/workflows/merge.yml
+++ b/.github/workflows/merge.yml
@@ -31,13 +31,13 @@ jobs:
     runs-on: ubuntu-latest
     timeout-minutes: 10
     steps:
-      - uses: actions/checkout@eef61447b9ff4aafe5dcd4e0bbf5d482be7e7871
+      - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683
         with:
           # Using fetch-depth 0 is the only way to get all tags which are needed for building docs.
           fetch-depth: 0
 
       - name: Checkout gh-pages branch to dir publish/
-        uses: actions/checkout@eef61447b9ff4aafe5dcd4e0bbf5d482be7e7871
+        uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683
         with:
           ref: gh-pages
           path: publish
diff --git a/.github/workflows/publish.yml b/.github/workflows/publish.yml
index 3f682a5..e7c7c42 100644
--- a/.github/workflows/publish.yml
+++ b/.github/workflows/publish.yml
@@ -31,13 +31,13 @@ jobs:
     runs-on: ubuntu-latest
     timeout-minutes: 10
     steps:
-      - uses: actions/checkout@eef61447b9ff4aafe5dcd4e0bbf5d482be7e7871
+      - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683
         with:
           # Using fetch-depth 0 is the only way to get all tags which are needed for building docs.
           fetch-depth: 0
 
       - name: Checkout gh-pages branch to dir publish/
-        uses: actions/checkout@eef61447b9ff4aafe5dcd4e0bbf5d482be7e7871
+        uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683
         with:
           ref: gh-pages
           path: publish