diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index ef617bbf..c203e346 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -161,7 +161,7 @@ jobs:
 
       # Upload the book now to retain it in case mdbook test fails.
       - name: Upload book
-        uses: actions/upload-artifact@v3
+        uses: actions/upload-artifact@v4
         with:
           name: comprehensive-rust-${{ matrix.language }}
           path: book/