diff --git a/.github/workflows/pull-request.yml b/.github/workflows/pull-request.yml
index 4812fb3..3ad106e 100644
--- a/.github/workflows/pull-request.yml
+++ b/.github/workflows/pull-request.yml
@@ -10,7 +10,7 @@ jobs:
     name: Check shell scripts
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@ac593985615ec2ede58e132d2e21d2b1cbd6127c # v3
+      - uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11 # v4
       - name: Run ShellCheck
         uses: ludeeus/action-shellcheck@00cae500b08a931fb5698e11e79bfbd38e612a38 # 2.0.0
 
@@ -20,7 +20,7 @@ jobs:
       image: rhysd/actionlint:1.6.23
       options: --cpus 1 --user root
     steps:
-      - uses: actions/checkout@ac593985615ec2ede58e132d2e21d2b1cbd6127c # v3
+      - uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11 # v4
       - name: Validate Github workflows
         run: |
           mkdir .git
@@ -29,7 +29,7 @@ jobs:
   lint-markdown:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@ac593985615ec2ede58e132d2e21d2b1cbd6127c # v3
+      - uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11 # v4
       - name: Validate Markdown file
         run: |
           npm install -g markdownlint-cli
diff --git a/.github/workflows/slash_ops_commands.yml b/.github/workflows/slash_ops_commands.yml
index 12b3f9d..d6893d1 100644
--- a/.github/workflows/slash_ops_commands.yml
+++ b/.github/workflows/slash_ops_commands.yml
@@ -44,7 +44,7 @@ jobs:
       pull-requests: write
     steps:
       - name: Checkout branch
-        uses: actions/checkout@ac593985615ec2ede58e132d2e21d2b1cbd6127c # v3
+        uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11 # v4
         with:
           ref: "refs/pull/${{ github.event.client_payload.slash_command.args.named.pull_request_number }}/head"
       - run: |
diff --git a/.github/workflows/terraform-tfsec.yml b/.github/workflows/terraform-tfsec.yml
index ed758fa..6863d1d 100644
--- a/.github/workflows/terraform-tfsec.yml
+++ b/.github/workflows/terraform-tfsec.yml
@@ -18,7 +18,7 @@ jobs:
 
     steps:
       - name: Clone repo
-        uses: actions/checkout@f43a0e5ff2bd294095638e18286ca9a3d1956744 # v3.6.0
+        uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11 # v4.1.1
 
       - name: Run tfsec
         uses: tfsec/tfsec-sarif-action@21ded20e8ca120cd9d3d6ab04ef746477542a608 # v0.1.4
diff --git a/.github/workflows/terraform.yml b/.github/workflows/terraform.yml
index 3fc1578..42fb948 100644
--- a/.github/workflows/terraform.yml
+++ b/.github/workflows/terraform.yml
@@ -21,7 +21,7 @@ jobs:
       run:
         working-directory: ${{ matrix.directories }}
     steps:
-      - uses: actions/checkout@f43a0e5ff2bd294095638e18286ca9a3d1956744 # v3.6.0
+      - uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11 # v4.1.1
 
       - uses: hashicorp/setup-terraform@633666f66e0061ca3b725c73b2ec20cd13a8fdd1 # v2.0.3
         with:
@@ -36,7 +36,7 @@ jobs:
   tflint:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@f43a0e5ff2bd294095638e18286ca9a3d1956744 # v3.6.0
+      - uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11 # v4.1.1
 
       - uses: actions/cache@6998d139ddd3e68c71e9e398d8e40b71a2f39812 # v3.2.5
         name: Cache plugin dir