diff --git a/.github/workflows/rust.yml b/.github/workflows/rust.yml
index a8c08fc..8e30dbe 100644
--- a/.github/workflows/rust.yml
+++ b/.github/workflows/rust.yml
@@ -22,6 +22,8 @@ jobs:
         uses: actions-rs/tarpaulin@v0.1.0
         with:
           out-type: Lcov
+          version: '0.15.0'
+          args: '-- --test-threads 1'
       - name: Coveralls upload
         uses: coverallsapp/github-action@1.1.3
         with: