diff --git a/.github/workflows/feature-branch.yml b/.github/workflows/feature-branch.yml
index 411e362..c25c099 100644
--- a/.github/workflows/feature-branch.yml
+++ b/.github/workflows/feature-branch.yml
@@ -12,7 +12,7 @@ jobs:
       matrix:
         python-version: ["3.10", "3.11"]
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11  # v4
 
       - name: Set up Python ${{ matrix.python-version }}
         uses: actions/setup-python@v4
@@ -44,7 +44,7 @@ jobs:
     steps:
       - name: Check out source repository
         # yamllint disable-line rule:comments
-        uses: actions/checkout@f43a0e5ff2bd294095638e18286ca9a3d1956744 # v3.6.0
+        uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11  # v4.1.1
 
       - name: Set up Python environment
         uses: actions/setup-python@v4
@@ -60,7 +60,7 @@ jobs:
     steps:
       - name: Check out source repository
         # yamllint disable-line rule:comments
-        uses: actions/checkout@f43a0e5ff2bd294095638e18286ca9a3d1956744 # v3.6.0
+        uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11  # v4.1.1
 
       - name: Set up Python environment
         uses: actions/setup-python@v4
diff --git a/.github/workflows/linter.yml b/.github/workflows/linter.yml
index 0cfb1e3..471ffed 100644
--- a/.github/workflows/linter.yml
+++ b/.github/workflows/linter.yml
@@ -40,7 +40,7 @@ jobs:
     needs: find-changes
     steps:
       # yamllint disable-line rule:comments
-      - uses: actions/checkout@f43a0e5ff2bd294095638e18286ca9a3d1956744 # v3.6.0
+      - uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11 # v4.1.1
 
       - name: Run JSON Lint
         run: bash <(curl -s https://raw.githubusercontent.com/CICDToolbox/json-lint/master/pipeline.sh)
@@ -52,7 +52,7 @@ jobs:
     needs: find-changes
     steps:
       # yamllint disable-line rule:comments
-      - uses: actions/checkout@f43a0e5ff2bd294095638e18286ca9a3d1956744 # v3.6.0
+      - uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11 # v4.1.1
 
       - name: Validate Markdown file
         run: |
@@ -66,7 +66,7 @@ jobs:
     needs: find-changes
     steps:
       # yamllint disable-line rule:comments
-      - uses: actions/checkout@f43a0e5ff2bd294095638e18286ca9a3d1956744 # v3.6.0
+      - uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11 # v4.1.1
 
       # yamllint disable-line rule:comments
       - uses: suzuki-shunsuke/github-action-renovate-config-validator@b7cd2b598bb51d071a2474e98f55cc25f91abec1 # v0.1.3
@@ -81,7 +81,7 @@ jobs:
       options: --cpus 1 --user root
     steps:
       # yamllint disable-line rule:comments
-      - uses: actions/checkout@f43a0e5ff2bd294095638e18286ca9a3d1956744 # v3.6.0
+      - uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11 # v4.1.1
 
       - name: Validate Github workflows
         run: |
@@ -95,7 +95,7 @@ jobs:
     if: needs.find-changes.outputs.yaml == 'true'
     steps:
       # yamllint disable-line rule:comments
-      - uses: actions/checkout@f43a0e5ff2bd294095638e18286ca9a3d1956744 # v3.6.0
+      - uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11 # v4.1.1
 
       - name: yaml-lint
         # yamllint disable-line rule:comments
diff --git a/.github/workflows/slash-ops-command-help.yml b/.github/workflows/slash-ops-command-help.yml
index 228a890..53ded1f 100644
--- a/.github/workflows/slash-ops-command-help.yml
+++ b/.github/workflows/slash-ops-command-help.yml
@@ -13,7 +13,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       # yamllint disable-line rule:comments
-      - uses: actions/checkout@f43a0e5ff2bd294095638e18286ca9a3d1956744 # v3.6.0
+      - uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11 # v4.1.1
 
       - name: Choose maintainer
         id: vars
diff --git a/.github/workflows/spelling.yml b/.github/workflows/spelling.yml
index c1f4a41..1817216 100644
--- a/.github/workflows/spelling.yml
+++ b/.github/workflows/spelling.yml
@@ -10,7 +10,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       # yamllint disable-line rule:comments
-      - uses: actions/checkout@f43a0e5ff2bd294095638e18286ca9a3d1956744 # v3.6.0
+      - uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11 # v4.1.1
 
       # yamllint disable-line rule:comments
       - uses: streetsidesoftware/cspell-action@52cba17693dc12d7d8f521631037008a17c93e53 # v5.0.0