diff --git a/.github/workflows/ci.yaml b/.github/workflows/ci.yaml
index 47d5379..d1f2525 100644
--- a/.github/workflows/ci.yaml
+++ b/.github/workflows/ci.yaml
@@ -9,7 +9,7 @@ jobs:
     name: Check Rust code
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@v6.0.3
       - uses: swatinem/rust-cache@v2
       - run: cargo fmt --all -- --check
       - run: cargo clippy --workspace --all-targets --all-features -- -D warnings