diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 84b1a2c93..348a2ce49 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -45,7 +45,7 @@ jobs:
           BUN_INSTALL_ALLOW_SCRIPTS: "@ast-grep/napi"
 
       - name: Run tests
-        run: bun test
+        run: bun test --max-concurrency 1
 
   typecheck:
     runs-on: ubuntu-latest