diff --git a/.github/workflows/pytest.yml b/.github/workflows/pytest.yml
index ddfe7a32..c5dd340f 100644
--- a/.github/workflows/pytest.yml
+++ b/.github/workflows/pytest.yml
@@ -102,6 +102,9 @@ jobs:
       - name: Install dependencies
         shell: bash
         run: uv pip install -e ".[dev]"
+      - name: Check formatting
+        shell: bash
+        run: uv run poe lint
       - name: Test with pytest
         shell: bash
         run: uv run poe test
diff --git a/pyproject.toml b/pyproject.toml
index 8e4d563c..4363567b 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -235,6 +235,7 @@ ignore = [
   "SIM117",   # forbids nested with statements
   "C400",     # wants to unnecessarily force use of list comprehension
   "UP037",    # can incorrectly (!) convert quoted type to unquoted type, causing an error
+  "UP045",    # imposes T | None instead of Optional[T]
 ]
 unfixable = ["F841", "F601", "F602", "B018"]
 extend-fixable = ["F401", "B905", "W291"]