diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index a79511d3..8203f6f8 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -10,6 +10,10 @@ on:
   workflow_dispatch:
     # allow manual runs on branches without a PR
 
+concurrency:
+  group: test-${{ github.ref }}
+  cancel-in-progress: true
+
 jobs:
   pre-commit:
     name: Pre-commit checks (mypy, flake8, etc.)