diff --git a/.gitea/workflows/build-image.yml b/.gitea/workflows/build-image.yml
index d798be9..a8e3606 100644
--- a/.gitea/workflows/build-image.yml
+++ b/.gitea/workflows/build-image.yml
@@ -8,6 +8,11 @@ on:
     branches:
     - main
 
+concurrency:
+  group: ${{ github.workflow }}-${{ github.event_name }}-${{ github.event.pull_request.number
+    || github.run_id }}
+  cancel-in-progress: ${{ github.event_name == 'pull_request' }}
+
 jobs:
   docker:
     runs-on: butler-ci