diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 2fb90ad..588d986 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -1,6 +1,9 @@
 name: CI
 
-on: workflow_dispatch
+on:
+  pull_request:
+    branches:
+      - master
 
 jobs:
   build: