diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 8f92786..1eb6752 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -1,6 +1,8 @@
 on:
-  - pull_request
-  - push
+  pull_request:
+  push:
+  schedule:
+    - cron: '0 0 * * *'
 
 name: build
 
diff --git a/.github/workflows/mutation.yml b/.github/workflows/mutation.yml
index 7878064..1350299 100644
--- a/.github/workflows/mutation.yml
+++ b/.github/workflows/mutation.yml
@@ -1,8 +1,8 @@
 on:
   pull_request:
   push:
-    branches:
-      - "master"
+  schedule:
+    - cron: '0 0 * * *'
 
 name: mutation test
 
diff --git a/.github/workflows/static.yml b/.github/workflows/static.yml
index 2867564..789b8c5 100644
--- a/.github/workflows/static.yml
+++ b/.github/workflows/static.yml
@@ -1,6 +1,8 @@
 on:
-  - pull_request
-  - push
+  pull_request:
+  push:
+  schedule:
+    - cron: '0 0 * * *'
 
 name: static analysis