diff --git a/.github/workflows/tox_run.yml b/.github/workflows/tox_run.yml
index 3c2c015e..dd8d80b3 100644
--- a/.github/workflows/tox_run.yml
+++ b/.github/workflows/tox_run.yml
@@ -1,6 +1,16 @@
 name: Tests
 
-on: [push]
+on:
+  # Trigger the workflow on push or pull request,
+  # but only for the main branch
+  push:
+    branches:
+      - master
+      - develop
+  pull_request:
+    branches:
+      - master
+      - develop
 
 jobs:
   test: