diff --git a/.github/workflows/firebase-hosting-merge.yml b/.github/workflows/firebase-hosting-merge.yml
index bd2c627..b0749b9 100644
--- a/.github/workflows/firebase-hosting-merge.yml
+++ b/.github/workflows/firebase-hosting-merge.yml
@@ -10,7 +10,7 @@ jobs:
   build_and_deploy:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
       - run: npm ci && npm run build
         working-directory: site2
       - uses: FirebaseExtended/action-hosting-deploy@v0
diff --git a/.github/workflows/firebase-hosting-pull-request.yml b/.github/workflows/firebase-hosting-pull-request.yml
index 5751e15..dc5c98b 100644
--- a/.github/workflows/firebase-hosting-pull-request.yml
+++ b/.github/workflows/firebase-hosting-pull-request.yml
@@ -7,7 +7,7 @@ jobs:
   build_and_preview:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
       - run: npm ci && npm run build
         working-directory: site2
       - uses: FirebaseExtended/action-hosting-deploy@v0
diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 4cd8c5b..6752885 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -5,7 +5,7 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
       - uses: actions/setup-node@v1
         with:
           node-version: '16'