diff --git a/.github/workflows/conda-env-create.yml b/.github/workflows/conda-env-create.yml
index d6809f0c0..67d488704 100644
--- a/.github/workflows/conda-env-create.yml
+++ b/.github/workflows/conda-env-create.yml
@@ -23,6 +23,14 @@ jobs:
         os: [ubuntu-latest, windows-latest, macos-latest]
         python-version: ["3.12", "3.13", "3.14"]
 
+        include:
+          - os: ubuntu-latest
+            conda-subdir: linux-64
+          - os: windows-latest
+            conda-subdir: win-64
+          - os: macos-latest
+            conda-subdir: osx-64 # Forces Rosetta emulation index on Apple Silicon
+
     runs-on: ${{ matrix.os }}
     timeout-minutes: 30
 
@@ -37,6 +45,9 @@ jobs:
 
       # ✅ Install via micromamba
       - uses: mamba-org/setup-micromamba@v3
+        env:
+          MAMBA_NO_CACHE: "true" # Forces libmamba to fetch completely fresh metadata
+          CONDA_SUBDIR: ${{ matrix.conda-subdir }} # Native for Win/Linux, Rosetta for Mac
         with:
           environment-name: tiatoolbox
           environment-file: requirements/requirements.conda.generated.yml
diff --git a/pyproject.toml b/pyproject.toml
index a3ec388a6..6cb0f5b3a 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -55,7 +55,7 @@ dependencies = [
   "tqdm>=4.64.1",
   "transformers>=5.15.0",
   "umap-learn>=0.5.3",
-  "wsidicom>=0.18.0, <0.36.0",
+  "wsidicom>=0.36.1",
   "zarr>=3.2.1",
 ]
 
diff --git a/tests/test_wsireader.py b/tests/test_wsireader.py
index a8e2723ce..0f0ef8fd1 100644
--- a/tests/test_wsireader.py
+++ b/tests/test_wsireader.py
@@ -3323,8 +3323,12 @@ def test_read_dicom_with_metadata(remote_sample: Callable) -> None:
     assert wsi.info.objective_power == 40.0
 
     wsi = DICOMWSIReader(wsi_path)
+
+    # Trigger _optical_path_sequence access
+    _ = hasattr(wsi.wsi.levels.base_level.datasets[0], "_optical_path_sequence")
+
     # Force delete attribute for objective power.
-    delattr(wsi.wsi.levels.base_level.datasets[0], "OpticalPathSequence")
+    delattr(wsi.wsi.levels.base_level.datasets[0], "_optical_path_sequence")
     wsi._info()
 
     # Assert objective power inferred from mpp.
diff --git a/tiatoolbox/wsicore/wsireader/dicom.py b/tiatoolbox/wsicore/wsireader/dicom.py
index 5f12ddf6f..abcaec390 100644
--- a/tiatoolbox/wsicore/wsireader/dicom.py
+++ b/tiatoolbox/wsicore/wsireader/dicom.py
@@ -61,7 +61,7 @@ def _info(self: DICOMWSIReader) -> WSIMeta:
         mpp = (mm_per_pixel.width * 1e3, mm_per_pixel.height * 1e3)
 
         objective_power = None
-        ops_seq = getattr(dataset, "OpticalPathSequence", None)
+        ops_seq = getattr(dataset, "_optical_path_sequence", None)
         if ops_seq:
             ops = ops_seq[0]
             if hasattr(ops, "ObjectiveLensPower"):
@@ -73,6 +73,7 @@ def _info(self: DICOMWSIReader) -> WSIMeta:
             mpp=mpp,
         )
 
+        vendor = getattr(dataset.base_metadata.equipment, "manufacturer", "Unknown")
         return WSIMeta(
             slide_dimensions=level_dimensions[0],
             level_dimensions=level_dimensions,
@@ -81,7 +82,7 @@ def _info(self: DICOMWSIReader) -> WSIMeta:
             mpp=mpp,
             objective_power=objective_power,
             level_count=len(level_dimensions),
-            vendor=dataset.Manufacturer,
+            vendor=vendor,
             file_path=self.input_path,
         )