diff --git a/.github/workflows/ci_nightly.yml b/.github/workflows/ci_nightly.yml
index 9f8d54213..c4ed0e15d 100644
--- a/.github/workflows/ci_nightly.yml
+++ b/.github/workflows/ci_nightly.yml
@@ -1,7 +1,7 @@
 name: nightly-check
 on:
-  schedule:           # performed on the last commit on default branch!
-    - cron: 0 6 * * * # every day at 6:00
+  schedule:             # performed on the last commit on default branch!
+    - cron: 0 6 * * 1,4 # Monday and Thursday at 6:00
 jobs:
   test:
     name: Julia ${{ matrix.version }} - ${{ matrix.os }} - ${{ matrix.arch }} - ${{ github.event_name }}