diff --git a/sources/.github/dependabot.yaml b/sources/.github/dependabot.yaml
index 8fd9b7f..8e2d719 100644
--- a/sources/.github/dependabot.yaml
+++ b/sources/.github/dependabot.yaml
@@ -6,8 +6,9 @@ version: 2
 updates:
   - package-ecosystem: github-actions
     directory: /
+    # https://docs.github.com/en/code-security/dependabot/dependabot-version-updates/configuration-options-for-the-dependabot.yml-file#scheduleinterval
     schedule:
-      interval: daily
+      interval: monthly
     open-pull-requests-limit: 1
     labels:
       - tag:bot
diff --git a/sources/.github/workflows/pre-commit-autoupdate.yaml b/sources/.github/workflows/pre-commit-autoupdate.yaml
index 489e32a..60c17d9 100644
--- a/sources/.github/workflows/pre-commit-autoupdate.yaml
+++ b/sources/.github/workflows/pre-commit-autoupdate.yaml
@@ -6,7 +6,7 @@ name: pre-commit-autoupdate
 
 on:
   schedule:
-    - cron: 0 0 * * *
+    - cron: 0 0 1 1,4,7,10 * # quarterly
   workflow_dispatch:
 
 jobs:
diff --git a/sources/.github/workflows/pre-commit-optional-autoupdate.yaml b/sources/.github/workflows/pre-commit-optional-autoupdate.yaml
index be79ad4..6639e5c 100644
--- a/sources/.github/workflows/pre-commit-optional-autoupdate.yaml
+++ b/sources/.github/workflows/pre-commit-optional-autoupdate.yaml
@@ -6,7 +6,7 @@ name: pre-commit-optional-autoupdate
 
 on:
   schedule:
-    - cron: 0 0 * * *
+    - cron: 0 0 1 1,4,7,10 * # quarterly
   workflow_dispatch:
 
 jobs: