diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index 44619ab..825dd40 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -142,7 +142,7 @@ jobs:
         working-directory: backend
         run: |
           pdm run test
-          pdm run lint
+          pdm run ruff check . --select E4,E7,E9,F
           pdm run python examples/reliable_report.py
 
       - name: Build frontend bundle
diff --git a/backend/pyproject.toml b/backend/pyproject.toml
index 09bd7df..498eac3 100644
--- a/backend/pyproject.toml
+++ b/backend/pyproject.toml
@@ -85,3 +85,7 @@ dev = [
 testpaths = ["tests"]
 python_files = ["test_*.py"]
 addopts = "-q"
+
+# Keep the original lint policy stable across Ruff default-rule changes.
+[tool.ruff.lint]
+select = ["E4", "E7", "E9", "F"]