diff --git a/.github/workflows/actionlint.yml b/.github/workflows/actionlint.yml
index be82ea5..0d977b0 100644
--- a/.github/workflows/actionlint.yml
+++ b/.github/workflows/actionlint.yml
@@ -9,6 +9,6 @@ jobs:
   actionlint:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@ac593985615ec2ede58e132d2e21d2b1cbd6127c # v3.3.0
+      - uses: actions/checkout@3df4ab11eba7bda6032a0b82a6bb43b11571feac # v3.3.0
       - name: "Check workflow files"
         uses: docker://docker.mirror.hashicorp.services/rhysd/actionlint:latest
diff --git a/.github/workflows/run-tests.yml b/.github/workflows/run-tests.yml
index ec917de..6d95dff 100644
--- a/.github/workflows/run-tests.yml
+++ b/.github/workflows/run-tests.yml
@@ -15,7 +15,7 @@ jobs:
     runs-on: ubuntu-latest
     timeout-minutes: 5
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@3df4ab11eba7bda6032a0b82a6bb43b11571feac
       - uses: ruby/setup-ruby@v1
         with:
           ruby-version: ${{ matrix.ruby }}