diff --git a/.github/workflows/pull-request.yaml b/.github/workflows/pull-request.yaml
index f864764..2632a7b 100644
--- a/.github/workflows/pull-request.yaml
+++ b/.github/workflows/pull-request.yaml
@@ -40,7 +40,7 @@ jobs:
         run: npm install -g aws-cdk@1
 
       - name: Checkout main
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
         with:
           ref: main
           fetch-depth: 0
@@ -52,7 +52,7 @@ jobs:
         run: cdk synth -o base.cdk.out
 
       - name: Checkout PR branch
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
         with:
           ref: ${{ github.head_ref }}
           fetch-depth: 0
@@ -86,7 +86,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
         with:
           ref: ${{ github.head_ref }}