diff --git a/.github/workflows/lint.yml b/.github/workflows/lint.yml
index 448b532..80d2518 100644
--- a/.github/workflows/lint.yml
+++ b/.github/workflows/lint.yml
@@ -8,7 +8,7 @@ jobs:
     env:
       SHELLCHECK_VERSION: 0.7.2
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v2.3.4
       - name: install shellcheck
         run: |
           wget -qO- "https://github.com/koalaman/shellcheck/releases/download/v${{ env.SHELLCHECK_VERSION }}/shellcheck-v${{ env.SHELLCHECK_VERSION }}.linux.x86_64.tar.xz" | tar -xJ
@@ -19,7 +19,7 @@ jobs:
     runs-on: ubuntu-20.04
     name: prettier
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v2.3.4
       - uses: actions/setup-node@v2.1.5
         with:
           node-version: "14.x"
diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 399e973..8dcf8bf 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -6,7 +6,7 @@ jobs:
     name: bash_unit
     runs-on: ubuntu-20.04
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v2.3.4
       - name: fetch hadolint version
         run: echo "HADOLINT_VERSION=$(cat HADOLINT_VERSION)" >> ${GITHUB_ENV}
       - name: install hadolint