diff --git a/.github/workflows/exercises.yml b/.github/workflows/exercises.yml
index f4463dda..9acdf18f 100644
--- a/.github/workflows/exercises.yml
+++ b/.github/workflows/exercises.yml
@@ -27,7 +27,7 @@ jobs:
 
     steps:
       - name: Checkout exercism/nim
-        uses: actions/checkout@93ea575cb5d8a053eaa0ac8fa3b40d7e05a33cc8
+        uses: actions/checkout@755da8c3cf115ac066823e79a1e1788f8940201b
 
       - name: Install Nim (devel)
         if: matrix.nim == 'devel'
diff --git a/.github/workflows/lint-whitespace.yml b/.github/workflows/lint-whitespace.yml
index d0715363..cba94739 100644
--- a/.github/workflows/lint-whitespace.yml
+++ b/.github/workflows/lint-whitespace.yml
@@ -8,7 +8,7 @@ jobs:
     runs-on: ubuntu-22.04
     steps:
       - name: Checkout
-        uses: actions/checkout@93ea575cb5d8a053eaa0ac8fa3b40d7e05a33cc8
+        uses: actions/checkout@755da8c3cf115ac066823e79a1e1788f8940201b
 
       - name: Check that every file has no trailing whitespace, and exactly one final newline
         run: ./.github/bin/lint-whitespace
diff --git a/.github/workflows/markdownlint.yml b/.github/workflows/markdownlint.yml
index 888f9548..6c068136 100644
--- a/.github/workflows/markdownlint.yml
+++ b/.github/workflows/markdownlint.yml
@@ -8,7 +8,7 @@ jobs:
     runs-on: ubuntu-22.04
     steps:
       - name: Checkout
-        uses: actions/checkout@93ea575cb5d8a053eaa0ac8fa3b40d7e05a33cc8
+        uses: actions/checkout@755da8c3cf115ac066823e79a1e1788f8940201b
 
       - name: Run markdownlint
         uses: DavidAnson/markdownlint-cli2-action@d57f8bd57670b9c1deedf71219dd494614ff3335
diff --git a/.github/workflows/shellcheck.yml b/.github/workflows/shellcheck.yml
index 836c6882..44bfdf9c 100644
--- a/.github/workflows/shellcheck.yml
+++ b/.github/workflows/shellcheck.yml
@@ -8,7 +8,7 @@ jobs:
     runs-on: ubuntu-22.04
     steps:
       - name: Checkout
-        uses: actions/checkout@93ea575cb5d8a053eaa0ac8fa3b40d7e05a33cc8
+        uses: actions/checkout@755da8c3cf115ac066823e79a1e1788f8940201b
 
       - name: Run shellcheck
         uses: ludeeus/action-shellcheck@94e0aab03ca135d11a35e5bfc14e6746dc56e7e9
diff --git a/.github/workflows/uuids.yml b/.github/workflows/uuids.yml
index 7f4d83d3..cf367a9a 100644
--- a/.github/workflows/uuids.yml
+++ b/.github/workflows/uuids.yml
@@ -8,7 +8,7 @@ jobs:
       NIM_VERSION: '1.6.10'
 
     steps:
-    - uses: actions/checkout@93ea575cb5d8a053eaa0ac8fa3b40d7e05a33cc8
+    - uses: actions/checkout@755da8c3cf115ac066823e79a1e1788f8940201b
 
     - name: Get the versions of the installed GCC and OpenSSL
       run: |