diff --git a/.github/workflows/checks.yml b/.github/workflows/checks.yml
index 8248de18..01daf2a7 100644
--- a/.github/workflows/checks.yml
+++ b/.github/workflows/checks.yml
@@ -67,4 +67,6 @@ jobs:
         run: yarn lint
 
       - name: run tests
+        env:
+          TEST_THREADS: 4
         run: yarn test