diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 3ac405d6..3e49864a 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -16,7 +16,7 @@ jobs:
   build:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v2.3.4
+      - uses: actions/checkout@v2.4.0
       - uses: technote-space/get-diff-action@v5
         id: git_diff
         with:
diff --git a/.github/workflows/codeql-analysis.yml b/.github/workflows/codeql-analysis.yml
index bf4d11aa..2e79ea8b 100644
--- a/.github/workflows/codeql-analysis.yml
+++ b/.github/workflows/codeql-analysis.yml
@@ -39,7 +39,7 @@ jobs:
 
     steps:
     - name: Checkout repository
-      uses: actions/checkout@v2
+      uses: actions/checkout@v2.4.0
 
     # Initializes the CodeQL tools for scanning.
     - name: Initialize CodeQL
diff --git a/.github/workflows/deploy-contract.yml b/.github/workflows/deploy-contract.yml
index dce81f5d..128627bb 100644
--- a/.github/workflows/deploy-contract.yml
+++ b/.github/workflows/deploy-contract.yml
@@ -16,7 +16,7 @@ jobs:
   deploy:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v2.3.4
+      - uses: actions/checkout@v2.4.0
       - name: Use Node.js
         uses: actions/setup-node@v2.4.1
         with:
diff --git a/.github/workflows/goreleaser.yml b/.github/workflows/goreleaser.yml
index 4efd3aca..ab21d49c 100644
--- a/.github/workflows/goreleaser.yml
+++ b/.github/workflows/goreleaser.yml
@@ -11,7 +11,7 @@ jobs:
   release:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v2.4.0
         with:
           fetch-depth: 0
       - uses: actions/setup-go@v2.1.4
diff --git a/.github/workflows/linkchecker.yml b/.github/workflows/linkchecker.yml
index 6c745ea4..27c6ca71 100644
--- a/.github/workflows/linkchecker.yml
+++ b/.github/workflows/linkchecker.yml
@@ -6,7 +6,7 @@ jobs:
   markdown-link-check:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v2.3.4
+      - uses: actions/checkout@v2.4.0
       - uses: gaurav-nelson/github-action-markdown-link-check@1.0.13
         with:
           folder-path: "docs"
diff --git a/.github/workflows/lint.yml b/.github/workflows/lint.yml
index 27fb74b8..09373651 100644
--- a/.github/workflows/lint.yml
+++ b/.github/workflows/lint.yml
@@ -13,7 +13,7 @@ jobs:
     runs-on: ubuntu-latest
     timeout-minutes: 10
     steps:
-      - uses: actions/checkout@v2.3.4
+      - uses: actions/checkout@v2.4.0
       - uses: technote-space/get-diff-action@v5
         with:
           SUFFIX_FILTER: |
diff --git a/.github/workflows/proto.yml b/.github/workflows/proto.yml
index 4ec3b07b..69e1b9b8 100644
--- a/.github/workflows/proto.yml
+++ b/.github/workflows/proto.yml
@@ -9,7 +9,7 @@ jobs:
     runs-on: ubuntu-latest
     timeout-minutes: 5
     steps:
-      - uses: actions/checkout@master
+      - uses: actions/checkout@v2.4.0
       - uses: technote-space/get-diff-action@v5
         with:
           PATTERNS: |
@@ -20,7 +20,7 @@ jobs:
   breakage:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@master
+      - uses: actions/checkout@v2.4.0
       - uses: technote-space/get-diff-action@v5
         with:
           PATTERNS: |
diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index e013a07a..552d8f42 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -37,7 +37,7 @@ jobs:
       - uses: actions/setup-go@v2.1.4
         with:
           go-version: 1.17
-      - uses: actions/checkout@v2.3.4
+      - uses: actions/checkout@v2.4.0
       - uses: technote-space/get-diff-action@v5
         with:
           PATTERNS: |
@@ -60,7 +60,7 @@ jobs:
   #   runs-on: ubuntu-latest
   #   timeout-minutes: 10
   #   steps:
-  #     - uses: actions/checkout@v2.3.4
+  #     - uses: actions/checkout@v2.4.0
   #     - uses: actions/setup-go@v2.1.4
   #       with:
   #         go-version: 1.17
@@ -80,7 +80,7 @@ jobs:
     runs-on: ubuntu-latest
     timeout-minutes: 60
     steps:
-      - uses: actions/checkout@v2.3.4
+      - uses: actions/checkout@v2.4.0
       - uses: technote-space/get-diff-action@v5
         id: git_diff
         with:
@@ -100,7 +100,7 @@ jobs:
     runs-on: ubuntu-latest
     timeout-minutes: 10
     steps:
-      - uses: actions/checkout@v2.3.4
+      - uses: actions/checkout@v2.4.0
       - uses: actions/setup-go@v2.1.4
         with:
           go-version: 1.17
@@ -132,7 +132,7 @@ jobs:
       - uses: actions/setup-go@v2.1.4
         with:
           go-version: 1.17
-      - uses: actions/checkout@v2.3.4
+      - uses: actions/checkout@v2.4.0
       - uses: technote-space/get-diff-action@v5
         with:
           PATTERNS: |