diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
index 55f298c33..057f3f063 100644
--- a/.pre-commit-config.yaml
+++ b/.pre-commit-config.yaml
@@ -61,8 +61,8 @@ repos:
         # major breakages (e.g. pypdf 7, openai 3) for the same reason.
         additional_dependencies:
           # --- Type stubs -----------------------------------------------
-          - django-stubs==6.0.3
-          - djangorestframework-stubs==3.16.9
+          - django-stubs==6.0.5
+          - djangorestframework-stubs==3.17.0
           - types-requests==2.33.0.20260408
           - types-PyYAML==6.0.12.20260408
           # --- Django runtime (must match requirements/base.txt) --------
diff --git a/opencontractserver/tasks/doc_tasks.py b/opencontractserver/tasks/doc_tasks.py
index 152141092..2f75c095f 100644
--- a/opencontractserver/tasks/doc_tasks.py
+++ b/opencontractserver/tasks/doc_tasks.py
@@ -256,10 +256,10 @@ def _create_document_processed_notifications(
         recipients.add(document.creator)
 
     # Add corpus owners from DocumentPath data (bulk fetch to avoid N+1)
-    corpus_creator_ids = {
-        data.get("corpus__creator_id")
+    corpus_creator_ids: set[int] = {
+        data["corpus__creator_id"]
         for data in corpus_data
-        if data.get("corpus__creator_id")
+        if data.get("corpus__creator_id") is not None
     }
     if corpus_creator_ids:
         corpus_creators = User.objects.filter(pk__in=corpus_creator_ids)
diff --git a/requirements/local.txt b/requirements/local.txt
index d7586b38a..28ff5b17c 100644
--- a/requirements/local.txt
+++ b/requirements/local.txt
@@ -7,7 +7,7 @@ watchfiles==1.2.0  # https://github.com/samuelcolvin/watchfiles
 # ------------------------------------------------------------------------------
 
 mypy==2.1.0  # https://github.com/python/mypy
-django-stubs==6.0.4  # https://github.com/typeddjango/django-stubs
+django-stubs==6.0.5  # https://github.com/typeddjango/django-stubs
 pytest==9.0.3  # https://github.com/pytest-dev/pytest
 pytest-cov==7.1.0  # https://github.com/pytest-dev/pytest-cov
 pytest-xdist==3.8.0  # https://github.com/pytest-dev/pytest-xdist (parallel test execution)