diff --git a/.github/workflows/test-package.yml b/.github/workflows/test-package.yml
index 9d3171a..8b4af12 100644
--- a/.github/workflows/test-package.yml
+++ b/.github/workflows/test-package.yml
@@ -63,6 +63,7 @@ jobs:
         run: dart test --platform chrome
         if: always() && steps.install.outcome == 'success'
       - name: Run Chrome tests - wasm
-        run: dart test --platform chrome --compiler dart2wasm
+        # TODO: investigate why we get hangs when concurrency is > 1
+        run: dart test --platform chrome --compiler dart2wasm -j 1
         # TODO: drop `dev` filter when dart2wasm is working on stable
         if: always() && steps.install.outcome == 'success' && matrix.sdk == 'dev'