diff --git a/.github/workflows/CI.yml b/.github/workflows/CI.yml
index be3db8d..de438ce 100644
--- a/.github/workflows/CI.yml
+++ b/.github/workflows/CI.yml
@@ -33,7 +33,7 @@ jobs:
             os: windows-latest
             rust: stable
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
         with:
           submodules: true
       - uses: dtolnay/rust-toolchain@master
@@ -46,7 +46,7 @@ jobs:
     name: format
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
         with:
           submodules: true
       - uses: dtolnay/rust-toolchain@nightly
@@ -58,7 +58,7 @@ jobs:
     name: lint
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
         with:
           submodules: true
       - uses: dtolnay/rust-toolchain@nightly
@@ -73,7 +73,7 @@ jobs:
     name: docs
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
         with:
           submodules: true
       - uses: dtolnay/rust-toolchain@stable