diff --git a/.github/workflows/test_nightly_many_os.yml b/.github/workflows/test_nightly_many_os.yml
index c5aaeb06faf..53c2e254e5f 100644
--- a/.github/workflows/test_nightly_many_os.yml
+++ b/.github/workflows/test_nightly_many_os.yml
@@ -1,5 +1,4 @@
 on:
-  pull_request:
   workflow_dispatch:
 
 name: Test latest nightly releases for macOS and Linux x86_64