diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index 3a32d859c..8c56dd6b5 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -1,5 +1,8 @@
 name: GitHub Actions CI
-on: [push]
+on:
+  push:
+    branches: master
+  pull_request: []
 jobs:
   tests:
     runs-on: ubuntu-latest