diff --git a/.github/workflows/update-js.yml b/.github/workflows/update-js.yml
index 9204d16..9e9f991 100644
--- a/.github/workflows/update-js.yml
+++ b/.github/workflows/update-js.yml
@@ -2,9 +2,9 @@ name: Update JS
 
 on:
   workflow_dispatch:
-  # Run on a schedule of once per quarter
+  # At 6:30 PM UTC, on day 1 of the month, only in March and September
   schedule:
-    - cron: '30 18 1 */3 *'
+    - cron: '30 18 1 3,9 *'
 
 permissions: {}