diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index cde8eb5..85de433 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -6,7 +6,7 @@ jobs:
   main:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@3df4ab11eba7bda6032a0b82a6bb43b11571feac # v4
       - id: yarn_cache
         run: echo "::set-output name=dir::$(yarn cache dir)"
       - uses: actions/cache@v3
diff --git a/.github/workflows/github-pages.yml b/.github/workflows/github-pages.yml
index 5395424..498083b 100644
--- a/.github/workflows/github-pages.yml
+++ b/.github/workflows/github-pages.yml
@@ -10,7 +10,7 @@ jobs:
     environment: github-pages
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@3df4ab11eba7bda6032a0b82a6bb43b11571feac # v4
       - uses: actions/setup-node@v3
         with: { node-version: lts/*, cache: yarn }
       - name: Build