diff --git a/.github/workflows/build_test.yml b/.github/workflows/build_test.yml
index 0f83596..c73c242 100644
--- a/.github/workflows/build_test.yml
+++ b/.github/workflows/build_test.yml
@@ -1,8 +1,7 @@
 name: Build Test
 on:
   schedule:
-    - cron:  '*/00 18 * * *'
-  workflow_dispatch:
+    - cron:  '*/30 5,17 * * *'
   push:
     branches:
     - 'master'