diff --git a/.github/dependabot.yml b/.github/dependabot.yml
index 5ace4600..f82a69c7 100644
--- a/.github/dependabot.yml
+++ b/.github/dependabot.yml
@@ -1,6 +1,14 @@
 version: 2
 updates:
+  # Each ecosystem batches all its version updates into a single pull request.
+  # Security updates are not grouped and still open immediately.
   - package-ecosystem: "github-actions"
     directory: "/"
     schedule:
-      interval: "weekly"
+      interval: "monthly"
+    cooldown:
+      default-days: 7
+    groups:
+      monthly-batch:
+        patterns:
+          - "*"
diff --git a/python/lsst/obs/base/defineVisits.py b/python/lsst/obs/base/defineVisits.py
index dc580c85..00eb1a6a 100644
--- a/python/lsst/obs/base/defineVisits.py
+++ b/python/lsst/obs/base/defineVisits.py
@@ -1476,7 +1476,7 @@ def compute(
         else:
             detectorBounds = self.computeExposureBounds(visit.exposures[0], collections=collections)
         visitBounds = []
-        detectorRegions = {}
+        detectorRegions: dict[int, Region] = {}
         for detectorId, bounds in detectorBounds.items():
             detectorRegions[detectorId] = ConvexPolygon.convexHull(bounds)
             visitBounds.extend(bounds)
diff --git a/python/lsst/obs/base/ingest_tests.py b/python/lsst/obs/base/ingest_tests.py
index 602a6d59..fd302197 100644
--- a/python/lsst/obs/base/ingest_tests.py
+++ b/python/lsst/obs/base/ingest_tests.py
@@ -554,7 +554,9 @@ def testDefineVisits(self) -> None:
             self.assertEqual(len(detectorVisitDataIds), len(camera))
             for dataId in detectorVisitDataIds:
                 assert isinstance(foundVisit.region, lsst.sphgeom.Region)
-                self.assertTrue(foundVisit.region.contains(dataId.region))
+                # Use bare assert for mypy.
+                assert dataId.region is not None
+                self.assertTrue(foundVisit.region.contains(dataId.region))  # type: ignore[call-overload]
 
         # Check obscore table again.
         self._check_obscore(butler.registry, has_visits=True)