diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 837032d6f13..cdb6d182ed8 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -888,6 +888,8 @@ jobs:
       - name: Run extension package boundary TypeScript check
         id: extension_package_boundary_tsc
         continue-on-error: true
+        env:
+          OPENCLAW_EXTENSION_BOUNDARY_CONCURRENCY: 4
         run: pnpm run test:extensions:package-boundary
 
       - name: Enforce safe external URL opening policy