diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index ddd1371..134f0f4 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -1,5 +1,9 @@
 name: CI
-on: [push, pull_request]
+on:
+  push:
+    branches: ["master"]
+  pull_request:
+
 jobs:
   tests:
     name: "Python ${{ matrix.python-version }}"