diff --git a/.github/workflows/buildx.yml b/.github/workflows/buildx.yml
index 87058e6..c1a59b3 100644
--- a/.github/workflows/buildx.yml
+++ b/.github/workflows/buildx.yml
@@ -21,7 +21,7 @@ jobs:
             platforms: linux/amd64,linux/arm64,linux/ppc64le,linux/s390x,linux/arm/v7,linux/arm/v6
     steps:
       - name: Checkout
-        uses: actions/checkout@v2
+        uses: actions/checkout@v2.3.4
 
       - name: Prepare
         id: prepare
diff --git a/.github/workflows/dockerimage.yml b/.github/workflows/dockerimage.yml
index 3b34668..87e1d3c 100644
--- a/.github/workflows/dockerimage.yml
+++ b/.github/workflows/dockerimage.yml
@@ -6,7 +6,7 @@ jobs:
   build:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v2.3.4
       - name: Build the Docker image
         run: |
           docker run -i $(docker build -q 12) /bin/sh -c "node --version && git --version"
diff --git a/.github/workflows/hadolint.yml b/.github/workflows/hadolint.yml
index 39052e9..d73584e 100644
--- a/.github/workflows/hadolint.yml
+++ b/.github/workflows/hadolint.yml
@@ -6,6 +6,6 @@ jobs:
   build:
     runs-on: macos-latest
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v2.3.4
       - run: brew install hadolint
       - run: hadolint {12,14}/Dockerfile