diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 89e5b62baeb..e4e7f9b863b 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -450,6 +450,7 @@ jobs:
 
       - name: Run ${{ matrix.task }} (${{ matrix.runtime }})
         env:
+          OPENCLAW_TEST_PROJECTS_PARALLEL: 3
           TASK: ${{ matrix.task }}
         shell: bash
         run: |