diff --git a/openadapt_flow/vision/hashing.py b/openadapt_flow/vision/hashing.py
index a02e18e3..6f25add5 100644
--- a/openadapt_flow/vision/hashing.py
+++ b/openadapt_flow/vision/hashing.py
@@ -38,7 +38,7 @@ def phash_png(png: bytes, region: Region | None = None) -> str:
     Raises:
         ValueError: If ``region`` is empty after clamping.
     """
-    img = Image.open(io.BytesIO(png))
+    img: Image.Image = Image.open(io.BytesIO(png))
     if region is not None:
         x, y, w, h = region
         x0, y0 = max(0, x), max(0, y)
diff --git a/pyproject.toml b/pyproject.toml
index ddb27edd..5dc19220 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -415,9 +415,7 @@ follow_imports_for_stubs = true
 #   - the VLM microservice (FastAPI, dynamic): services.vlm_service.*
 #   - offline validation harnesses (not on the runtime path):
 #     validation.* (dense_surface, identity_ladder,
-#     pixel_identity_probe, pixel_identity_aligned,
-#     vlm_identity_probe)
-#   - perceptual hashing on numpy internals: vision.hashing
+#     pixel_identity_probe, vlm_identity_probe)
 [[tool.mypy.overrides]]
 module = [
     "openadapt_flow.__main__",
@@ -437,9 +435,7 @@ module = [
     "openadapt_flow.validation.dense_surface",
     "openadapt_flow.validation.identity_ladder",
     "openadapt_flow.validation.pixel_identity_probe",
-    "openadapt_flow.validation.pixel_identity_aligned",
     "openadapt_flow.validation.vlm_identity_probe",
-    "openadapt_flow.vision.hashing",
 ]
 ignore_errors = true