diff --git a/.github/workflows/tox_verify.yaml b/.github/workflows/tox_verify.yaml
index 24eb8239273..b941e79b2d0 100644
--- a/.github/workflows/tox_verify.yaml
+++ b/.github/workflows/tox_verify.yaml
@@ -1,6 +1,14 @@
 name: Tox
 
-on: [push, pull_request, workflow_dispatch]
+on:
+  push:
+    branches: [main]
+  pull_request:
+  workflow_dispatch:
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.head_ref || github.run_id }}
+  cancel-in-progress: true
 
 jobs:
   lint: