diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 7430ae4f..1daa6f2c 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -5,7 +5,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: checkout
-        uses: actions/checkout@v2
+        uses: actions/checkout@v4
       - name: rustup
         uses: actions-rs/toolchain@v1
         with:
@@ -24,7 +24,7 @@ jobs:
     runs-on: ${{ matrix.platform }}
     steps:
       - name: checkout
-        uses: actions/checkout@v2
+        uses: actions/checkout@v4
       - name: rustup
         uses: actions-rs/toolchain@v1
         with:
@@ -42,7 +42,7 @@ jobs:
     runs-on: ${{ matrix.platform }}
     steps:
       - name: checkout
-        uses: actions/checkout@v2
+        uses: actions/checkout@v4
       - name: rustup
         uses: actions-rs/toolchain@v1
         with:
@@ -61,7 +61,7 @@ jobs:
     if: github.ref == 'refs/heads/master'
     steps:
       - name: checkout
-        uses: actions/checkout@v2
+        uses: actions/checkout@v4
       - name: rustup
         uses: actions-rs/toolchain@v1
         with: