diff --git a/.github/workflows/on-demand.yml b/.github/workflows/on-demand.yml
index 33fdc4a..650873f 100644
--- a/.github/workflows/on-demand.yml
+++ b/.github/workflows/on-demand.yml
@@ -13,7 +13,10 @@ on:
         required: true
         type: string
 
-# TODO: add concurrency check to cancel in-progress builds
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
 jobs:
   build:
     runs-on: ubuntu-latest