diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index af9a27663b..1e389382f3 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -1,12 +1,19 @@
 name: CI
+
 on:
   push:
     branches:
       - master
   pull_request:
+
 env:
   HOMEBREW_DEVELOPER: 1
   HOMEBREW_NO_AUTO_UPDATE: 1
+
+concurrency:
+  group: "${{ github.ref }}"
+  cancel-in-progress: ${{ github.event_name == 'pull_request' }}
+
 jobs:
   syntax:
     if: github.repository == 'Homebrew/brew'