diff --git a/.github/workflows/codeql-analysis.yml b/.github/workflows/codeql-analysis.yml
index a5e037d..11949c5 100644
--- a/.github/workflows/codeql-analysis.yml
+++ b/.github/workflows/codeql-analysis.yml
@@ -35,7 +35,7 @@ jobs:
 
     steps:
     - name: Checkout repository
-      uses: actions/checkout@v2
+      uses: actions/checkout@v2.3.4
 
     # Initializes the CodeQL tools for scanning.
     - name: Initialize CodeQL
diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index b150a68..5ec9c35 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -11,7 +11,7 @@ jobs:
       uses: actions/setup-node@v2.1.5
 
     - name: Checkout
-      uses: actions/checkout@v2
+      uses: actions/checkout@v2.3.4
 
     - name: Unshallow
       run: git fetch --prune --unshallow
@@ -30,7 +30,7 @@ jobs:
     needs: [tag]
     steps:
       - name: Checkout
-        uses: actions/checkout@v2
+        uses: actions/checkout@v2.3.4
 
       - name: Unshallow
         run: git fetch --prune --unshallow
diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index eed6c06..21a92e9 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -21,7 +21,7 @@ jobs:
       id: go
 
     - name: Checkout
-      uses: actions/checkout@v2
+      uses: actions/checkout@v2.3.4
 
     - name: golangci-lint
       uses: golangci/golangci-lint-action@v2.5.2
@@ -40,7 +40,7 @@ jobs:
       id: go
 
     - name: Checkout
-      uses: actions/checkout@v2
+      uses: actions/checkout@v2.3.4
 
     - name: Test
       run: go test -coverprofile cover.out ./...
@@ -56,7 +56,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
     - name: Checkout
-      uses: actions/checkout@v2
+      uses: actions/checkout@v2.3.4
 
     - name: Unshallow
       run: git fetch --prune --unshallow