diff --git a/src/open_samus_returns_rando/__init__.py b/src/open_samus_returns_rando/__init__.py
index d05e9c16..12e9841a 100644
--- a/src/open_samus_returns_rando/__init__.py
+++ b/src/open_samus_returns_rando/__init__.py
@@ -3,9 +3,9 @@
 from .patch_util import patch_with_status_update
 
 
-def patch(input_path: Path, output_path: Path, configuration: dict) -> None:
+def patch(input_path: Path, input_exheader: Path, output_path: Path, configuration: dict) -> None:
     from .samus_returns_patcher import patch_extracted
-    return patch_extracted(input_path, output_path, configuration)
+    return patch_extracted(input_path, input_exheader, output_path, configuration)
 
 
 __all__ = [
diff --git a/src/open_samus_returns_rando/lua_editor.py b/src/open_samus_returns_rando/lua_editor.py
index 3be4c7de..703dc9a6 100644
--- a/src/open_samus_returns_rando/lua_editor.py
+++ b/src/open_samus_returns_rando/lua_editor.py
@@ -67,7 +67,7 @@ def _read_level_lua(level_id: str) -> str:
     "s110_surfaceb": "s00",
 }
 
-def get_parent_for(item_id) -> str:
+def get_parent_for(item_id: str) -> str:
     return SPECIFIC_CLASSES.get(item_id, "RandomizerPowerup")
 
 class ScriptClass:
diff --git a/src/open_samus_returns_rando/multiworld_integration.py b/src/open_samus_returns_rando/multiworld_integration.py
index 6901c475..f8a10a55 100644
--- a/src/open_samus_returns_rando/multiworld_integration.py
+++ b/src/open_samus_returns_rando/multiworld_integration.py
@@ -5,7 +5,7 @@
 from open_samus_returns_rando.misc_patches.lua_util import lua_convert
 
 
-def get_lua_for_item(progression: list[list[dict[str, str | int]]]):
+def get_lua_for_item(progression: list[list[dict[str, str | int]]]) -> str:
     generic_pickup = """
     Game.ImportLibrary("actors/items/randomizerpowerup/scripts/randomizerpowerup.lc", false)
     MultiworldPickup = MultiworldPickup or {}
@@ -33,13 +33,13 @@ def get_lua_for_item(progression: list[list[dict[str, str | int]]]):
     )
 
 
-def create_exefs_patches(out_code: Path, out_exheader: Path, input_exheader: Path, enabled: bool, region: str):
+def create_exefs_patches(out_code: Path, out_exheader: Path, input_exheader: Path, enabled: bool, region: str) -> None:
     if not enabled:
         return
 
     import shutil
 
-    import ips
+    import ips  # type: ignore
 
     # Citra and Luma don't support patching the exheader. User needs to provide it as input and
     # here the patch is just applied
diff --git a/src/open_samus_returns_rando/samus_returns_patcher.py b/src/open_samus_returns_rando/samus_returns_patcher.py
index 251bc209..6bffc63f 100644
--- a/src/open_samus_returns_rando/samus_returns_patcher.py
+++ b/src/open_samus_returns_rando/samus_returns_patcher.py
@@ -50,7 +50,7 @@ def add_custom_files(editor: PatcherEditor) -> None:
 
 
 
-def validate(configuration: dict, input_exheader: Path | None):
+def validate(configuration: dict, input_exheader: Path | None) -> None:
     # validate patcher json with the schema.json
     DefaultValidatingDraft7Validator(_read_schema()).validate(configuration)
 
@@ -66,7 +66,7 @@ def validate(configuration: dict, input_exheader: Path | None):
 
 
 
-def patch_extracted(input_path: Path, input_exheader: Path, output_path: Path, configuration: dict):
+def patch_extracted(input_path: Path, input_exheader: Path, output_path: Path, configuration: dict) -> None:
     LOG.info("Will patch files from %s", input_path)
 
     validate(configuration, input_exheader)