diff --git a/base/extract_rom.py b/base/extract_rom.py
index d490f390..03c2547b 100644
--- a/base/extract_rom.py
+++ b/base/extract_rom.py
@@ -41,7 +41,10 @@ def _extract_data_recursive(folder: fnt.Folder, output_dir: Path) -> None:
     for child_file in folder.files:
         out_file = output_dir / child_file
         out_file.parent.mkdir(exist_ok=True, parents=True)
-        out_file.write_bytes(rom.files[folder.idOf(child_file)])
+        file_id = folder.idOf(child_file)
+        if file_id is None:
+            raise Exception(f'ID of file {child_file} not found')
+        out_file.write_bytes(rom.files[file_id])
     for child_folder_name, child_folder in folder.folders:
         _extract_data_recursive(child_folder, output_dir / child_folder_name)
 
diff --git a/base/rebuild_rom.py b/base/rebuild_rom.py
index f1bf5bb1..bee26a6f 100644
--- a/base/rebuild_rom.py
+++ b/base/rebuild_rom.py
@@ -74,7 +74,7 @@ def reinsert_overlays(rom: NintendoDSRom, overlay_directory: Path) -> None:
             # we'll handle adding the new overlay after this loop
             continue
 
-        ot[overlay_number].data = overlay_file.read_bytes()
+        ot[overlay_number].data = bytearray(overlay_file.read_bytes())
         rom.files[ot[overlay_number].fileID] = ot[overlay_number].save(compress=False)
         print(f'Rebuilt overlay_{str(overlay_number).rjust(4, "0")}.bin')
 
@@ -100,7 +100,7 @@ def reinsert_overlays(rom: NintendoDSRom, overlay_directory: Path) -> None:
         flags=0,
     )
     ot[new_overlay_number] = new_overlay
-    rom.files.append(None)
+    rom.files.append(None)  # type: ignore
     rom.files[new_overlay_file_id] = new_overlay.save(compress=False)
     print(
         f'Added new overlay_{str(new_overlay_number).rjust(4, "0")}.bin '
diff --git a/base/requirements.txt b/base/requirements.txt
index 2cd7b527..e92305a1 100644
--- a/base/requirements.txt
+++ b/base/requirements.txt
@@ -1,4 +1,4 @@
 click==8.1.3
-ndspy==4.1.0
+ndspy @ git+https://github.com/mike8699/ndspy.git@9d80480e8a3d65a389aac6f5d10978bd9113c977
 Pillow==10.3.0
-zed @ git+https://github.com/phst-randomizer/zed.git@5ee969236bf3c3d0707da963e5edc818ddf246d3
+zed @ git+https://github.com/phst-randomizer/zed.git@e59a9653ea1344cbc147bab446821813200b9d19
diff --git a/pyproject.toml b/pyproject.toml
index 1ef8cddf..51cff998 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -7,12 +7,12 @@ dependencies = [
     "PySide6==6.6.1",
     "click==8.1.3",
     "inflection==0.5.1",
-    "ndspy==4.1.0",
+    "ndspy@git+https://github.com/mike8699/ndspy.git@9d80480e8a3d65a389aac6f5d10978bd9113c977",
     "ordered-set==4.1.0",
     "pydantic==2.4.2",
     "pyparsing==3.1.1",
     "vidua==0.4.5",
-    "zed@git+https://github.com/phst-randomizer/zed.git@5ee969236bf3c3d0707da963e5edc818ddf246d3",
+    "zed@git+https://github.com/phst-randomizer/zed.git@e59a9653ea1344cbc147bab446821813200b9d19",
 ]
 
 [project.optional-dependencies]
diff --git a/scripts/dump_zmb.py b/scripts/dump_zmb.py
index 35cc2654..e56a9bfa 100644
--- a/scripts/dump_zmb.py
+++ b/scripts/dump_zmb.py
@@ -20,7 +20,10 @@
     output_dir = Path.cwd() / 'zmbs'
     output_dir.mkdir(exist_ok=True)
 
-    for folder in tqdm(rom.filenames.subfolder('Map').folders):
+    map_subfolder = rom.filenames.subfolder('Map')
+    assert map_subfolder is not None
+
+    for folder in tqdm(map_subfolder.folders):
         folder_name = folder[0]
         file_path = f'Map/{folder_name}'
         for subfolder in folder: