diff --git a/.github/workflows/diff-spec.yml b/.github/workflows/diff-spec.yml
index fa6d30c..7272fb3 100644
--- a/.github/workflows/diff-spec.yml
+++ b/.github/workflows/diff-spec.yml
@@ -3,7 +3,7 @@ name: Diff spec
 on:
     workflow_dispatch:
     schedule:
-        - cron: '0 0 * * MON'
+        - cron: '0 0 1 * *'
 
 jobs:
     check-spec: