diff --git a/.github/workflows/ci.yaml b/.github/workflows/ci.yaml
index 031fc60..80bc5d6 100644
--- a/.github/workflows/ci.yaml
+++ b/.github/workflows/ci.yaml
@@ -20,7 +20,7 @@ jobs:
     runs-on: ubuntu-18.04
     steps:
       - name: Clone repository
-        uses: actions/checkout@v2
+        uses: actions/checkout@v2.3.4
       - name: Record the Clang version
         run: clang --version
       - name: Record the GCC version
@@ -34,7 +34,7 @@ jobs:
     runs-on: ubuntu-18.04
     steps:
       - name: Clone repository
-        uses: actions/checkout@v2
+        uses: actions/checkout@v2.3.4
       - name: Record the Clang version
         run: clang --version
       - name: Record the GCC version
diff --git a/.github/workflows/linter.yaml b/.github/workflows/linter.yaml
index 7523d85..a0957ad 100644
--- a/.github/workflows/linter.yaml
+++ b/.github/workflows/linter.yaml
@@ -21,7 +21,7 @@ jobs:
     runs-on: ubuntu-18.04
     steps:
       - name: Clone repository
-        uses: actions/checkout@v2
+        uses: actions/checkout@v2.3.4
       - name: Lint Markdown and YAML files
         uses: docker://github/super-linter:v3.3.2
         env: