diff --git a/.github/workflows/run-tests.yml b/.github/workflows/run-tests.yml
index 2510022..786529f 100644
--- a/.github/workflows/run-tests.yml
+++ b/.github/workflows/run-tests.yml
@@ -1,5 +1,12 @@
 name: Run tests on pushes and on PRs
-on: [push, pull_request]
+on:
+  push:
+    branches:
+      - master
+  pull_request:
+    branches:
+      - master
+
 jobs:
   run_tests:
     name: Run tests