diff --git a/.github/workflows/rebase.yml b/.github/workflows/rebase.yml
index 4dbe62a..9951bc7 100644
--- a/.github/workflows/rebase.yml
+++ b/.github/workflows/rebase.yml
@@ -8,7 +8,7 @@ jobs:
     if: github.event.issue.pull_request != '' && contains(github.event.comment.body, '/rebase')
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v2.3.4
         with:
           token: ${{ secrets.PAT_TOKEN }}
           fetch-depth: 0 # otherwise, you will failed to push refs to dest repo
diff --git a/.github/workflows/sync-release-version.yml b/.github/workflows/sync-release-version.yml
index 5b29ed4..f4e8cba 100644
--- a/.github/workflows/sync-release-version.yml
+++ b/.github/workflows/sync-release-version.yml
@@ -8,7 +8,7 @@ jobs:
   update-version:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v2.3.4
         with:
           fetch-depth: 0
       - name: Sync release version.
diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index b082642..da942fd 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -16,7 +16,7 @@ jobs:
     name: Test branch-name
     steps:
       - name: Checkout
-        uses: actions/checkout@v2
+        uses: actions/checkout@v2.3.4
       - name: Run test
         id: branch-name
         uses: ./