diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 88d659a..50135d2 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -52,6 +52,11 @@ jobs:
         if: matrix.os == 'ubuntu' && matrix.rust == 'nightly'
       - run: cargo run -- expand --manifest-path tests/Cargo.toml > expand.rs && diff tests/lib.expand.rs expand.rs
         if: startsWith(matrix.rust, 'nightly')
+      - uses: actions/upload-artifact@v4
+        if: matrix.os == 'ubunut' && matrix.rust == 'nightly' && always()
+        with:
+          name: Cargo.lock
+          path: Cargo.lock
 
   clippy:
     name: Clippy