diff --git a/.github/workflows/default.yml b/.github/workflows/default.yml
index 2a5a04a..b8afcc4 100644
--- a/.github/workflows/default.yml
+++ b/.github/workflows/default.yml
@@ -2,6 +2,10 @@ name: Test and deploy to GitHub Pages
 
 on: [push]
 
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: ${{ github.ref != 'refs/heads/main' }}
+
 jobs:
   init:
     uses: ./.github/workflows/00-init.yml