diff --git a/README.md b/README.md
index 86f4262..2ea5437 100644
--- a/README.md
+++ b/README.md
@@ -16,7 +16,7 @@ jobs:
     name: cargo test
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - uses: dtolnay/rust-toolchain@stable
       - run: cargo test --all-features
 ```