diff --git a/.github/workflows/codacy-analysis.yml b/.github/workflows/codacy-analysis.yml
index 03880e7..60027e4 100644
--- a/.github/workflows/codacy-analysis.yml
+++ b/.github/workflows/codacy-analysis.yml
@@ -29,7 +29,7 @@ jobs:
     steps:
       # Checkout the repository to the GitHub Actions runner
       - name: Checkout code
-        uses: actions/checkout@v3
+        uses: actions/checkout@3df4ab11eba7bda6032a0b82a6bb43b11571feac # v4
 
       # Execute Codacy Analysis CLI and generate a SARIF output with the security issues identified during the analysis
       - name: Run Codacy Analysis CLI
diff --git a/.github/workflows/rebase.yml b/.github/workflows/rebase.yml
index 0c601fd..239e453 100644
--- a/.github/workflows/rebase.yml
+++ b/.github/workflows/rebase.yml
@@ -8,7 +8,7 @@ jobs:
     if: github.event.issue.pull_request != '' && contains(github.event.comment.body, '/rebase')
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@3df4ab11eba7bda6032a0b82a6bb43b11571feac # v4
         with:
           token: ${{ secrets.PAT_TOKEN }}
           fetch-depth: 0 # otherwise, you will failed to push refs to dest repo
diff --git a/.github/workflows/sync-release-version.yml b/.github/workflows/sync-release-version.yml
index 5aff5a4..530dca9 100644
--- a/.github/workflows/sync-release-version.yml
+++ b/.github/workflows/sync-release-version.yml
@@ -8,7 +8,7 @@ jobs:
   update-version:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@3df4ab11eba7bda6032a0b82a6bb43b11571feac # v4
         with:
           fetch-depth: 0
       - name: Run release-tagger
diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 576f94e..bd7b0ad 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -14,7 +14,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout
-        uses: actions/checkout@v3
+        uses: actions/checkout@3df4ab11eba7bda6032a0b82a6bb43b11571feac # v4
       - name: shellcheck
         uses: reviewdog/action-shellcheck@v1
 
@@ -28,7 +28,7 @@ jobs:
 
     steps:
       - name: Checkout
-        uses: actions/checkout@v3
+        uses: actions/checkout@3df4ab11eba7bda6032a0b82a6bb43b11571feac # v4
       - name: Run test
         uses: ./
       - name: Verify Changed files
diff --git a/.github/workflows/update-readme.yml b/.github/workflows/update-readme.yml
index 9a4e87a..e8a9e4e 100644
--- a/.github/workflows/update-readme.yml
+++ b/.github/workflows/update-readme.yml
@@ -9,7 +9,7 @@ jobs:
   sync-assets:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3.6.0
+      - uses: actions/checkout@3df4ab11eba7bda6032a0b82a6bb43b11571feac # v4.0.0
         with:
           fetch-depth: 0