diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index f51bad5..59764ea 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -1,4 +1,7 @@
-on: [push]
+on:
+  pull_request:
+    branches:
+      - main
 name: build
 jobs:
   build:
diff --git a/.github/workflows/security-audit.yml b/.github/workflows/security-audit.yml
index fa95789..6c1c529 100644
--- a/.github/workflows/security-audit.yml
+++ b/.github/workflows/security-audit.yml
@@ -1,7 +1,5 @@
 name: Security audit
 on:
-  schedule:
-    - cron: "0 8 * * *"
   push:
     paths:
       - "**/Cargo.*"