diff --git a/.github/workflows/api_test.yml b/.github/workflows/api_test.yml
index 7c634d828..45d99a579 100644
--- a/.github/workflows/api_test.yml
+++ b/.github/workflows/api_test.yml
@@ -45,8 +45,9 @@ jobs:
     timeout-minutes: 50
     strategy:
       fail-fast: false
+      max-parallel: 2
       matrix:
-        os: [ubuntu-latest, macos-latest, windows-latest]
+        os: ${{ (github.event_name == 'push' && github.ref == 'refs/heads/main') && fromJSON('["ubuntu-24.04", "macos-14", "windows-latest"]') || fromJSON('["ubuntu-24.04"]') }}
     
     steps:
       - uses: actions/checkout@v6