diff --git a/.github/workflows/cancel.yml b/.github/workflows/cancel.yml
index 23703ea..1913e49 100644
--- a/.github/workflows/cancel.yml
+++ b/.github/workflows/cancel.yml
@@ -1,5 +1,13 @@
 name: Cancel
-on: [push]
+on:
+  push:
+    branches:
+      - master
+      - next
+  pull_request:
+    branches:
+      - master
+      - next
 permissions: {} # none
 jobs:
   cancel: