diff --git a/.github/workflows/test-coverage.yaml b/.github/workflows/test-coverage.yaml
index 0ab748d65..a659541e1 100644
--- a/.github/workflows/test-coverage.yaml
+++ b/.github/workflows/test-coverage.yaml
@@ -14,6 +14,7 @@ jobs:
     runs-on: ubuntu-latest
     env:
       GITHUB_PAT: ${{ secrets.GITHUB_TOKEN }}
+      TESTTHAT_PARALLEL: false
 
     steps:
       - uses: actions/checkout@v4