diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index cc1da1c4..886e6a26 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -8,6 +8,10 @@ on:
     branches:
       - main
 
+concurrency:
+  group: ci-main-${{ github.ref }}
+  cancel-in-progress: ${{ github.ref != 'refs/heads/main' }}
+
 env:
   PYTEST_ADDOPTS: "--color=yes"
 
diff --git a/tox.ini b/tox.ini
index d9ce1c6d..85f996bd 100644
--- a/tox.ini
+++ b/tox.ini
@@ -53,7 +53,7 @@ deps =
     ruff==0.9.5
     mypy==1.15.0
 commands =
-    ruff check {posargs:pytest_django pytest_django_test tests}
+    ruff check --diff {posargs:pytest_django pytest_django_test tests}
     ruff format --quiet --diff {posargs:pytest_django pytest_django_test tests}
     mypy {posargs:pytest_django pytest_django_test tests}